Linux-Networking Digest #377, Volume #12 Thu, 26 Aug 99 22:13:29 EDT
Contents:
Re: ppp problems (Clifford Kite)
Re: Firewall Rules ("YouDontKnowWho")
Re: [newbie] proxy services? ("YouDontKnowWho")
Re: usiing MS proxies server and linux (Toylet Duck)
Re: General Sendmail Question ("Cowles, Steve")
Re: IP Masq. / port problem.. (luke)
Re: routed problem (Mark Johnson)
Re: Tcl/Tk. I want to learn it. (William Burrow)
Re: Masquerading + Samba? (Kertis Henderson)
Class A Subnet ("Mehmet T. Avcioglu")
Re: Is this possible with RedHat 6.0? (Simon Green)
Re: Servers not responding when access from network (Simon Green)
Re: How to login Linux from DOS? (Saeser)
where can I buy an email alias? (John Doe)
Re: Port Scanner (H.Bruijn)
Re: Compaq Onboard Ethernet (Mark Price)
Re: VMware - wow! (John Thompson)
Re: General Sendmail Question (Jeff Peterson)
----------------------------------------------------------------------------
From: kite@NoSpam.%inetport.com (Clifford Kite)
Subject: Re: ppp problems
Date: 26 Aug 1999 18:49:31 -0500
Dominic Tynes ([EMAIL PROTECTED]) wrote:
: I am unable to connect to a ppp dial-in server.
: I am running RH 6.0 with an external 56K US Robotics modem. Dial-in works
: under 98.
: To get an idea of what was expected by the dial-in server, the first command
: I ran was:
: /usr/sbin/pppd /dev/ttyS0 57600 debug connect "/usr/sbin/chat -v '' AT OK
: ATDT1234567 CONNECT '\d\c'"
: This was in /var/log/ppp:
: Aug 25 21:57:51 localhost pppd[690]: pppd 2.3.7 started by root, uid 0
[edited]
: Aug 25 21:58:14 localhost pppd[690]: Serial connection established.
: Aug 25 21:58:14 localhost pppd[690]: Using interface ppp0
: Aug 25 21:58:14 localhost pppd[690]: Connect: ppp0 <--> /dev/ttyS0
: Aug 25 21:58:15 localhost pppd[690]: sent [LCP ConfReq id=0x1 <asyncmap 0x0>
: <magic 0xa54acd7d> <pcomp> <accomp>]
: Aug 25 21:58:15 localhost pppd[690]: rcvd [LCP ConfReq id=0x1 <mru 1534>
: <asyncmap 0xa0000> <auth 0xc027 01 00 00 03 00 00 00 0e> <magic 0xc5fa16c4>
: <accomp> < 11 04 05 fe> < 12 02> < 13 09 03 00 01 cb f2 08 01>]
: Aug 25 21:58:15 localhost pppd[690]: sent [LCP ConfRej id=0x1 <auth 0xc027
: 01 00 00 03 00 00 00 0e> < 11 04 05 fe> < 12 02> < 13 09 03 00 01 cb f2 08
: 01>]
The peer requests SPAP (0xc027), aka Shiva PAP, and pppd doesn't
implement it - it's "patented." Since you are not configured for any
other authentication pppd rejects it, and thereby all types of PPP
authentication negotiated by LCP. Rejection of all PPP authentication
doesn't set well with the peer and, although it tries a few more time,
the peer terminates.
[snipped]
: Based on that, I set up pap-secrets and chap-secrets as:
: # Secrets for authentication using PAP
: # client server secret IP addresses
: fakeuser * fakepass *
: and
: # Secrets for authentication using CHAP
: # client server secret IP addresses
: fakeuser * fakepass *
The right start, except you don't need or want the last field, the `*'.
: respectively, then ran:
: /usr/sbin/pppd /dev/ttyS0 57600 debug user fakeuser connect
: "/usr/sbin/chat -v -t 20 '' ATDT1234567 CONNECT '' TIMEOUT 5 serid:--serid:
: fakeuser assword? fakepass"
What you see isn't always what you get - a reference to what you saw
using minicom. The login/password prompts may be for certain privileged
callers but not for a PPP account; very few if any ISP want both a
login/password and PPP authentication. The ISP promptly hungup after
you entered your password, which is evidence that this might be the case.
I'd go back to the first script and add the option user fakename to it,
now that you have the secrets files set up it might work since then pppd
should Nak the SPAP and request PAP or CHAP. The ISP might be configured
for one of those as an alternative authentication.
The input/output error was caused by the hangup.
--
Clifford Kite <kite@inet%port.com> Not a guru. (tm)
/* Microsoft is a great marketing organization.
* It _has_ to be */
------------------------------
From: "YouDontKnowWho" <[EMAIL PROTECTED]>
Subject: Re: Firewall Rules
Date: Thu, 26 Aug 1999 23:46:37 GMT
No, you don't. The rules just allow for the possibility of you having
one, so they set up the access. If you don't use DHCP, comment out
those rules.
--
Principle of Minimum Access: "That which is not explicitly permitted
is denied."
ANNOUNCER: And now we return to our regularly scheduled, uncommonly
entertaining thread...
Jake Colman wrote in message <[EMAIL PROTECTED]>...
>>>>>> "MP" == Mark Post <[EMAIL PROTECTED]> writes:
>
> MP> On Wed, 25 Aug 1999 15:23:48 -0000, "Robert_Glover"
> MP> <Please_reply_to@newsgroup> wrote:
>
>
> MP> Here's what I created today by using the web-based tool at
> MP> http://rlz.ne.mediaone.net/linux/firewall/index.html
>
>I checked out that site and I am a bit confused. Are you required to
have a
>DHCP in order to use it? I have a small home network with ppp access
to my
>ISP. I plan on using IPMASQ to masquerade and share my single
connection
>with the rest of the network. How/ehy does DHCP come into play with
this?
>
>--
>Jake Colman
>
>Principia Partners LLC Phone: (201) 946-0300
>Harborside Financial Center Fax: (201) 946-0320
>902 Plaza II Beeper: (800) 505-2795
>Jersey City, NJ 07311 E-mail: [EMAIL PROTECTED]
> E-mail: [EMAIL PROTECTED]
> web: http://www.ppllc.com
------------------------------
From: "YouDontKnowWho" <[EMAIL PROTECTED]>
Subject: Re: [newbie] proxy services?
Date: Thu, 26 Aug 1999 23:46:37 GMT
If you want to replace WinGate on an NT box with something else on a
Linux box, you need to look into IPCHAINS and MASQUERADING.
--
Principle of Minimum Access: "That which is not explicitly permitted
is denied."
ANNOUNCER: And now we return to our regularly scheduled, uncommonly
entertaining thread...
Kenneth Wong wrote in message ...
>Hi,
>
> I've got a general question about home networks connected to the
>internet via cable modem.
>
> right now, I'm using NT with Wingate 3 as my proxy server. It
works
>pretty well, seeing as though there's next to no configuration to be
done.
>And, after installing clients on the one other machine in the house,
>there was no need to setup any applications to go through the proxy.
>Wingate handled all that for me.
>
> I was wondering whether the same type of setup could be
accomplished
>with Apache or Squid on my Linux box. Or if I should be reading up
on
>other technologies in order to get this type of setup up and running.
>
>Ken.
>
>
------------------------------
From: Toylet Duck <[EMAIL PROTECTED]>
Crossposted-To:
alt.os.linux,alt.os.linux.caldera,comp.os.linux,comp.os.linux.help,comp.os.linux.misc,comp.os.linux.questions
Subject: Re: usiing MS proxies server and linux
Date: Fri, 27 Aug 1999 07:09:08 +0800
Can I use Squid to solve the problem?
Any methods to "emulate" a MS Proxy Client
using Linux software? It should be possible,
shouldn't it?
> In order to use smtp and pop through MS proxy server you need the winsock
> proxy client. Which, being a windows app, won't run on Linux.
------------------------------
From: "Cowles, Steve" <[EMAIL PROTECTED]>
Subject: Re: General Sendmail Question
Date: Thu, 26 Aug 1999 19:00:44 -0500
Jeff,
See below...
Steve Cowles
SWCowles at gte dot net
Jeff Peterson <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]...
> I have set up a mail server using RH6 (also serves as my workstation) that
> is able to send and receive email through the internet.
>
> I would like to do is move this box to only perform email/web/ftp server
> functions and then set up a new box for personal use. That way I can
> screw around all I want with "my" box without messing with the server
> services.
>
> My questions:
>
> 1) Do I just continue to leave mail on the server and pick it up via POP
> or IMAP?
Thats up to you. You can always point your mail program (on your new box) to
POP mail from your mail server and store them locally on your new box.
>
> 2) If I don't pick the mail up with POP, can the mail server just deliver
> it to my machine automatically? Where can I be pointed to for
> reconfiguring this?
There are many ways to accomplish this through sendmail. The easist way is
to simply edit the /etc/aliases file and add the following: NOTE: I'm using
jpeterson as an example.
jpeterson: [EMAIL PROTECTED]
Then type: "newaliases" to recompile the alias file. Now when a new email
arrives for jpeterson, sendmail will not deliver it locally, but resend it
to newbox.mydomain.com. The only negitive about using the alias file is the
email headers are modified. ie mail addressed to [EMAIL PROTECTED] are
re-addressed to [EMAIL PROTECTED]
If you feel brave (wanting a good weekend project), enable the "mailertable"
directives in /etc/sendmail.cf. By doing so, all inbound email will be
"relayed" to the mailserver that is specified in /etc/mail/mailertable. ie
your new box behind your linux firewall. The nice thing about the
mailertable directive, is it does NOT readdress the email headers. ie mail
addressed to [EMAIL PROTECTED] arrives at the internal mail server as
[EMAIL PROTECTED]
There are a few prerequisites that will have to be done in order to make
this work. 1) remove domain.com from /etc/sendmail.cw from your mail server
so that sendmail will not try and deliver email locally. 2) add domain.com
to the /etc/sendmail.cw on your new linux server. Then it will deliver the
"relayed" email to your local mailbox. 3) If your running bind, make sure
your zone tables contain an entry for your new box. If your not running
bind, make sure your mail servers /etc/hosts file contains an entry for your
new box. 4) Edit the /etc/mail/access file and add an RELAY entry for your
new box. Otherwise, sendmail will not "relay" inbound emails to your new
box.
example of /etc/mail/mailertable:
domain.com esmtp:newbox.domain.com
then type: makemap hash mailertable.db <mailertable to compile the database.
>
> 3) When I create mail on my machine, does my machine send it out directly
> to the internet, or does it get routed to my mail server for for ultimated
> delivery? I like to use KMail for mail reading/creation.
This is up to you on how you want to configure outbound email on your new
box. I don't use KMail personally, but if KMail hands off all email to
sendmail (for delivery) and you have ipchains setup properly (on your
firewall), your new box can send email, on its own, through your firewall.
> 4) If I have to send outbound internet mail to my mail server for
> delivery, what file needs to be configured?
Again, this is up to you on how you want to configure outbound email. If you
want to "relay" all outbound email to your existing mail server, edit the
following line in /etc/sendmail.cf (on your new box) to tell sendmail to
"relay" all outbound emails off of your other linux box (mail server).
# "Smart" relay host (may be null)
DS
to
# "Smart" relay host (may be null)
DSmailserver.domain.com
>
> 5) What mail related services need to be running on a workstation?
Both of your Linux boxes will need sendmail to be running, they will just be
configured differently.
>
> Thanks for any help. I am planning to buy the O'Reilly book on sendmail
> to get an idea how all of this is supposed to work. I have heard that the
> book does not include some of the latest updates/features though.
It contains what I described above. There is a second edition that has been
out for awhile. Also checkout www.sendmail.org.
>
> Jeff Peterson
> [EMAIL PROTECTED]
> [EMAIL PROTECTED]
>
> ------------------ Posted via CNET Linux Help ------------------
> http://www.searchlinux.com
------------------------------
From: luke <[EMAIL PROTECTED]>
Subject: Re: IP Masq. / port problem..
Date: Fri, 27 Aug 1999 00:52:54 GMT
Never mind, i found it..
luke wrote:
>
> Can some one tell me how to setup something like port forwarding,
> because i have ip masq. setup, so when some one tries to connect to a
> certain port, it forwards that to one of the machines on the LAN, i know
> in kernel 2.0 it was "ipautofw", but what about in the 2.2 kernel?
>
> Thanks alot
> --
> "Punk rock?!?!?! Isn't that the type of music where kids cut
> each other with razor blades and knives?"
--
"Punk rock?!?!?! Isn't that the type of music where kids cut
each other with razor blades and knives?"
------------------------------
From: Mark Johnson <markj*no*spam*@gilanet.com>
Subject: Re: routed problem
Date: Thu, 26 Aug 1999 18:01:46 -0600
Reply-To: markj*no*spam*@gilanet.com
"Tiberio, David" wrote:
> no, I am not confusing anything.
>
> the network address is 216.46.84.16
> the netmask is 255.255.255.240
>
> my ips are from 216.46.85.19 to 215.46.85.35
You may be confused about subnet addressing:
>From section 6.3 of the Subnet HOWTO, your netmask implies a maximum 14
hosts/subnet, and a maximum of 16 subnets. You apparently have 16 hosts on your
subnet. I believe you may only use ips between 216.46.85.17 and 216.46.85.31,
inclusive.
Or, you may want to use netmask=216.46.85.224, network=216.46.85.32, and any
host ips between 216.46.85.33 and 216.46.85.62, inclusive.
Also, subnetting (only) works locally, ie, within the group of 16 subnets, while
routed is designed principally to handle routing between non-local nets.
216.32.200.0 is a non-local Class C net.
This is my (non-authoritative!) understanding. I hope it helps.
------------------------------
From: [EMAIL PROTECTED] (William Burrow)
Crossposted-To: comp.os.linux.misc
Subject: Re: Tcl/Tk. I want to learn it.
Date: 27 Aug 1999 00:04:26 GMT
Reply-To: [EMAIL PROTECTED]
On Thu, 26 Aug 1999 05:30:59 GMT,
Sean <[EMAIL PROTECTED]> wrote:
>I'm new to Linux. Lets get that strait. I've had it for almost two weeks
...song&dance...
>frontend for my app that I want to port to Linux. Now I know it's not
>*visual* and I like that but can someone tell me where I can get EVERYTHING
>I need to make apps in Tcl/Tk and where to download them all. As well as
>some good tutorials since I've never even seen Tcl/Tk code yet but I want
>tutorials that go beyond the basics.
Visit:
http://www.scriptics.com
>2.3.13. Thanks for any reply but please e-mail it to me instaed of posting
>it :)
Too late now.
BTW, there is some kind of ``visual'' tool for Tcl/Tk. Saw it mentioned
in Ousterhouts book. Get a copy of that as well.
--
William Burrow -- New Brunswick, Canada o
Copyright 1999 William Burrow ~ /\
~ ()>()
------------------------------
From: Kertis Henderson <[EMAIL PROTECTED]>
Subject: Re: Masquerading + Samba?
Date: Thu, 26 Aug 1999 20:30:03 -0400
I forgot to mention this, but I read Samba's BROWSING.txt, and it only
covers WINS servers. My network doesn't use WINS, so this file didn't
help me. Thanks for any input.
--
Kertis Henderson
[EMAIL PROTECTED]
------------------------------
Date: Thu, 26 Aug 1999 20:49:56 -0400
From: "Mehmet T. Avcioglu" <[EMAIL PROTECTED]>
Crossposted-To: alt.os.linux.mandrake
Subject: Class A Subnet
I have IP space from a class A network. However, the subnet mask I use
is understandably smaller than 255.0.0.0. The configuration is as
follows.
eth0 A.B.C.10 255.255.255.128
Each time the box reboots, the following routes are added.
A.B.C.0 255.255.255.128 eth0
A.0.0.0 255.0.0.0 eth0
This leaves the whole class A network out of the reach of this computer.
The only thing I can think of is the ipcalc program that ifup script
uses. But it isn't even supposed to run that program since I entered the
information.
Any help on this would be apreciated.
I am using Mandrake 6.0
--
Mehmet T. Avcioglu
------------------------------
From: Simon Green <[EMAIL PROTECTED]>
Subject: Re: Is this possible with RedHat 6.0?
Date: Fri, 27 Aug 1999 10:24:41 +1000
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Authentication is addressed in the form of packet-filtering firewalling rules.
For example, suppose (as is the case at my house) I have a Linux PC, with an
Ethernet card, address 192.168.50.3, and a PPP connection to my ISP.
My sister has my old computer, with ethernet, and address 192.168.50.2. She
wants to use web from her room, but I don't want all and sundry pretending to
be me. So:
ipchains -P forward DENY #Deny everyone I don't
specifically allow.
ipchains -A forward -s 192.168.50.0/24 -j MASQ #Allow anyone on my
private LAN (ie, my sister's PC).
You could also put -i eth0 (or something like that) on the end, to specify that
the packets must be received on the Ethernet LAN. This would reject any packets
that (though extremely unlikely) might appear on the ppp0 port (and this would
most certainly be an attack). Whether it's worth the effort or not is up to
you, since no Internet router will route packets from the private address
ranges.
Cheers
Simon
George Torralba wrote:
> My linux box which is behind a cisco 675 modem/router which does NAT
> can never authenticate a connection, always returns NO-USER. With
> masquerading, how is this addressed? Will pidentd be able to
> authenticate connections/processes not running in the linux box?
>
> George
>
> On Thu, 26 Aug 1999 21:26:42 +1000, Simon Green <[EMAIL PROTECTED]>
> wrote:
>
> >Linux can do NAT, like those cool little personal ISDN routers, only Linux
> >calls it "masquerading". So, not only can your Linux box be the mail server
> >(and DNS server, and NNTP server, and <insert important service here>
> >server) but using NAT your users can get onto the Internet through it as a
> >router too. Linux also includes packet filtering for firewalling purposes.
> >
> >Masquerading and firewalling are controlled using the ipchains program for
> >2.2+. I recommend the Ethernet HOWTO (because there are gotchas for
> >multiple Ethernet cards) and the Multiple-Ethernet HOWTO, and the
> >Firewalling HOWTO.
> >
> >These are usually to be found in /usr/doc/HOWTO, but a quick search on the
> >Web will turn them up if you want to make sure you've got the latest one.
> >
> >
> >Goran Begicevic wrote:
> >
> >> I'm getting leased ine into our company and three IP-numbers assingned
> >> to us.
> >>
> >> One Linux computer is going to get one of IP-numbers/URL's assigned to
> >> it and act as our Apache webb server for rest of people on internet. So
> >> far so good.
> >>
> >> Now the question:
> >>
> >> I would like to use same Linux computer as our mail-server and gateway.
> >> With other words, rest of company's computers will still have it's
> >> internal 192.168.xxx.xxx IP-numbers, and use second NIC on webb server
> >> to connect to internet and collect mail from it.
> >>
> >> Now is this possible/hard to do and is there a good howto/FAQ? I'm
> >> pretty new to Linux but i used IRIX for some time.
> >>
> >> Any help apreciated. Thank you.
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adr:;;5th floor, 76 Berry St ;Nth Sydney;NSW;2060;Australia
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==============EDF7DA7EB38B8B64C07EE158==
------------------------------
From: Simon Green <[EMAIL PROTECTED]>
Subject: Re: Servers not responding when access from network
Date: Fri, 27 Aug 1999 10:00:31 +1000
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In that case, your options are pretty limited. Later kernels include a "user"
masquerading module. I'm not sure of the details, but it allows you to create
user-level masquerading dirvers for services that require them. That may be what
you need.
Simon
Matthew Ho wrote:
> Simon,
>
> Masquerading is included in the kernel and masquerading is working fine.
> I just use one ipchains rule to enable the masq functionality.
> ipchains -A forward -j MASQ -s 192.168.0.0/24 -d 0.0.0.0/0
>
> That is why I am fustrated when phonepatch at port 1084 and fsgs at port
> 6112 don't work..
>
> Anyways, thanks for your reply Simon.
>
> Matthew
>
> Simon Green wrote:
> >
> > You may need to rebuild the kernel, and ensure that masquerading is included
> > in the kernel. Also, check /etc/sysconfig/network to make sure forwarding is
> > switched on. Finally, check the forwarding/firewalling rules in force: use
> > ipchains --list.
> >
> > I also find that SOCKS works much better in complement with NAT than NAT
> > alone for web; my sister's keen on Hotmail (ugh) and she couldn't load it
> > through a straight NAT setup, even though normal pages (like www.linux.org
> > ;-) worked fine.
> >
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------------------------------
Date: Thu, 26 Aug 1999 19:05:04 -0500
From: Saeser <[EMAIL PROTECTED]>
Subject: Re: How to login Linux from DOS?
GreGo wrote:
> Somebody help me with my problem? I want to login to RedHat 6.0 from
> DOS. How can I do that and when can I find programs for this?
> I use network card Realtek 8019, DOS 6.22.
> Thanks
> GreGo
It used to be possible to go to the Microsoft ftp site and get the DOS
Client (for NTS). I've used it before to connect to the NT machine at
work. It's been about 2-3 years since that time though.
[EMAIL PROTECTED]
------------------------------
From: [EMAIL PROTECTED] (John Doe)
Subject: where can I buy an email alias?
Reply-To: [EMAIL PROTECTED]
Date: 26 Aug 1999 20:40:30 -0500
I would like to buy a reliable email alias.
Thanks,
------------------------------
From: [EMAIL PROTECTED] (H.Bruijn)
Subject: Re: Port Scanner
Date: 27 Aug 1999 00:24:32 GMT
Reply-To: [EMAIL PROTECTED]
On Thu, 26 Aug 1999 20:18:21 GMT, Vlar Schreidlocke allegedly wrote:
>What's a good Linux based port scanner that will scan my other Windows
>98 computer on another dialup account to see what ports are active?
>Also, what is a good Windows 98 based port scanner that I can test my
>Linux box with. I am going to run my Linux (Red Hat 6.0) box as a
>firewall and gateway connected to a cablemodem and I want to test my
>vulnerability to hacking once I get everything setup. Hopefully the
>port scanners you suggest will be able to scan single addresses, so
>that I don't piss anybody else off.
>
>
in linux "netstat -a" will give a list of all ports that are being
listened at.
strobe is a really good linux portscanner to scan your windows machine
for linux software in general you can search at http://freshmeat.net
For windows software you can always try http://www.tucows.com .
Beware to test your firewall you need to add the machine your testing from
to the list of adresses that will be denied, that in order to get
significant info.
A good start is to comment out all entries you do not use from
/etc/inetd.conf and to edit the hosts.deny and hosts.allow entries to
secure the services you leave open in inetd.conf
see the manual pages (man tcpd) for more info on tcp/ip wrappers and how
they are implemented in the /etc/hosts.* files
ipchains is the best way of course.
Read the linux security guide :
https://www.seifried.org/lasg
--
Herman
-- ------------------------------------------------------------------
If a trainstation is place where trains stop, what is workstation?
=====================================================================
Herman Bruijn hbruijn dix.Mines.EDU
------------------------------
From: Mark Price <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.hardware
Subject: Re: Compaq Onboard Ethernet
Date: Thu, 26 Aug 1999 17:17:02 -0700
I think the chipset is AMD 79C70 and the driver is a PCNET32, at least on the
590XL (which is my machine).
Here's some info from my box.
Bus 0, device 11, function 0:
Ethernet controller: AMD 79C970 (rev 2).
Medium devsel. IRQ 5. Master Capable. No bursts.
I/O at 0x7140 [0x7141].
[root@ravenwood /proc]# /sbin/lsmod
Module Size Used by
pcnet32 7784 1 (autoclean)
Cheers, Mark.
Tom Eastep wrote:
>
> Kyle Hargraves wrote:
> >
> > I'm wondering if anyone has been able to use the onboard ethernet on the Compaq
>Deskpro series.
> > I believe the chipset is the same on the 590 through the 5133 - I'm using a 590.
>I've already
> > tried the on-board support in 2.2.10. I'll gladly upgrade or downgrade to make
>this work - I
> > just don't want to spend money on going out and buying a card (mainly because I
>don't have the
> > money to spend). The kernel doesn't want to recognize that there is ethernet on
>the systemboard.
> > I'd try and look through manuals, but this is a secondhand machine I managed to
>scrounge up,
> > so I have none. Any help would be greatly appreciated.
> >
>
> There are two common types of onboard NICs on Compaq systems - the
> system I'm sending this on uses the de4x5 driver.
>
> a) Dec 2114x which can use either the Tulip or de4x5 drivers.
> b) Netelligent adapters which use the tlan driver.
>
> One of these drivers should work for you...
------------------------------
From: John Thompson <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.misc,comp.os.linux.setup
Subject: Re: VMware - wow!
Date: Thu, 26 Aug 1999 16:01:37 -0600
steve mcadams wrote:
> I guess most people have no experience with true virtual machine
> operating systems like IBM's VM/ESA (or whatever its latest version has
> been renamed to, I've been away from it since 93).
>
> They have an operating system they called CP (Control Program) that runs
> the base hardware. Its sole purpose in life is to TRANSPARENTLY host
> other operating systems. The operating systems running on top of it can
> not tell they are not running natively. You can even run CP
> second-level on top of CP to debug it. It runs at full processor speed,
> the systems on top of it run at full processor speed except that there
> are lot of interrupts happening that are processed by CP and result in
> remapping of memory and hardware to allow sharing of the processor and
> its associated hardware on a transparent basis.
>
> It is my understanding that the Intel x86 architecture lacks a couple of
> instructions that make TOTAL TRANSPARENCY impossible. This is why I was
> initially skeptical.
>
> If vmware is running on top of NT or on top of Linux then at best it is
> acting as an interpreter. Better than nothing but absolutely not a true
> virtual machine operating system by the definition that I'm used to.
I fear this could easily degenerate into something analogous
to the eternally tiresome tirades about whether Win9x is a
"real" operating system. Yuck.
If VMWare allows you to run other operating sytems from
within linux, fine; that sounds like a useful capability. I
may even decide to use it myself, sometime. If it's not a
Truly Bless�d Totally Transparent (tm) Virtual Machine, then
so be it. I suspect many people are willing to put up with
that "limitation."
--
-John ([EMAIL PROTECTED])
------------------------------
From: [EMAIL PROTECTED] (Jeff Peterson)
Subject: Re: General Sendmail Question
Date: Fri, 27 Aug 1999 01:15:55 GMT
Steve,
Thanks for the assist. I should be getting the other machine next
week and will try setting it up then.
I am just experimenting to see how mail and web servers function and
don't quite know how things should be set up overall. I will probably
try various things, along with what you mentioned.
One thing that I would like to see out there in the documentation
world is some sort of "real world" example that take a person through
the process of how servers and client are set up. Most of the
examples that I have seen do not do this and seem to fly over my head
because I don't understand yet the overall scheme on how these things
work.
Jeff Peterson
[EMAIL PROTECTED]
------------------------------
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