Linux-Networking Digest #394, Volume #11 Thu, 3 Jun 99 20:13:36 EDT
Contents:
Redhat 6.0 & ipmasqerade problems (Dean Kimberlee Wilson)
Re: Installing IpChains in RH 6.0 (Kevin Martin)
how to send a ARP request? ([EMAIL PROTECTED])
Link Question (Arthur Merar)
Re: Need help getting networking running ("Ian")
Re: Win95->Linux PPP can't see past subnet (Robin Munn)
$SOCKS_N Environment ("Tim Cairl")
Getting Linux through MS Proxy Server? ("Benjamin Walling")
Re: Microsoft Exchange ([EMAIL PROTECTED])
Re: Forwarding of broadcasts possible? ([EMAIL PROTECTED])
Re: Dial On Demand on RH6.0 ("Bob Rakov")
Turn off messages on the screen? (Chiyu Wang)
Re: What is this for?!?! (David Lewis)
Re: autodial for IP masq (norman elliott)
Re: Before I screw up the internet.... (Kevin Martin)
Re: nmap kills my interface! ([EMAIL PROTECTED])
Re: Telnet using "root" ("Adam C. Emerson")
HOW TO change reported IP ??? ("Peter")
Re: How can I tell if it is Linux? ("Adam C. Emerson")
Re: linux ADSL setup - name resolution problem (DonJr)
Re: Port numbers ([EMAIL PROTECTED])
----------------------------------------------------------------------------
From: Dean Kimberlee Wilson <[EMAIL PROTECTED]>
Crossposted-To: comp.security.firewalls
Subject: Redhat 6.0 & ipmasqerade problems
Date: Thu, 3 Jun 1999 18:21:55 -0500
Hi, all. I recently installed RedHat 6.0, and recompiled kernel 2.2.9
with all the newest port-forwarding and routing options. I then used
ipchains to forward anything originating on the private side of my
firewall. That all works fine. However, I would like to forward web
connections to an internal machine, and I've had a #@** of a time doing
it.
I've installed ipmasqadm, but when I connect to my public IP through a web
browswer, I get "Unable to connect to remote host." (Obviously, I'd like
the browser to be seamlessly forwarded from my firewall to one of my
private machines.) I've read all the posts, but none of which seem to do
the trick. Can anyone tell me what I'm doing wrong?
(I finally tried redir, which did the trick, but doesn't do anything for
forwarding udp packets, AFAIK. I think I need to forward UDP packets to
accomplish my 2nd goal -- hosting games of Unreal from behind my firewall)
Here's my setup:
#(in rc.firewall, which runs at startup)
#(fine and dandy so far for forwarding to the outside)
/sbin/ipchains -F input
/sbin/ipchains -F output
/sbin/ipchains -F forward
ipchains -M -S 7200 10 60
ipchains -P forward DENY
ipchains -A forward -s 10.1.6.0/16 -j MASQ
Then I've manually tried (many combinations of) the following:
ipmasqadm portfw -a -P tcp -L (my public IP) 80 -R 10.1.6.3 80
ipmasqadm portfw -a -P udp -L (my public IP) 80 -R 10.1.6.3 80
or
ipchains -I input -p tcp -y -d (my public IP)/16 80 -m 1
ipmasqadm mfw -I -m 1 -r 10.1.6.3 80 -p 10
Any help would be greatly appreciated.
Thanks,
Dean Wilson
________________________________________________________________________
Dean Wilson
KU Academic Computing Services
-- User Services
[EMAIL PROTECTED]
(785) 864-0374
------------------------------
Crossposted-To: comp.os.linux.setup
From: [EMAIL PROTECTED] (Kevin Martin)
Subject: Re: Installing IpChains in RH 6.0
Date: Thu, 03 Jun 1999 22:50:38 GMT
In article <[EMAIL PROTECTED]>, it says
[EMAIL PROTECTED] (Dzerdecki) wrote:
>I am having trouble even finding the ipchains command.
Get it here:
http://www.rustcorp.com/linux/ipchains
> I dont know if I need
>to complile a new kernel for RH 6.0 before I can use the make config command.
If you *don't* run "make config" FIRST, you won't have much luck making a
new kernel. :-)
>How would I do this?
In exact sequential order:
cd /usr/src/linux
make mrproper
(engage in much pondering and thinking about what you need to include)
make config (where you enter the results of above pondering)
make dep ; make clean
make bzimage
cp /usr/src/linux/arch/i386/boot/bzimage /boot
pico /etc/lilo.conf
(enter the new /boot/bzimage as a new paragraph like the existing ones --
put it first so it's the default if you like, but don't remove the existing
'linux' paragraph. Give the new paragraph a unique name, such as "new")
/sbin/lilo
shutdown -r now
(Machine reboots)
(log in as root. If you decided to make anything as modules, do:)
cd /usr/src/linux
make modules ; make modules_install
>Thanks.
You're welcome. Just realize please that this is NO LONGER a networking
question, okay? Followups set to c.o.l.setup only, for that reason.
------------------------------
From: [EMAIL PROTECTED]
Subject: how to send a ARP request?
Date: Wed, 02 Jun 1999 15:22:49 GMT
I am managing three Linux box each has a number of virtual hosts. One
problem happens when I try to move one virtual host from machine A to B.
I deleted the dummy device of this virtual host on A and added on on B.
When I am within this subnet, everything works fine. But I cannot ping
the virtual host outside the subnet!!(it get no response at all).
After reading the ARP document, I suspect that the router didn't
update its ARP cache -- that ip of that virutal host still points to the
old ethernet card. One method to update the router's cache is that
I send a ARP request to the router(from machine B) with the new
ehternet address and ip(then the router will update it according to the
document). Can anybody tell me how to initiate such a request? 'arp'
command apparently cannot do this. And because the virtual host is using
a dummy device, simply ping router will only send a arp request with the
"main" ip address(ip that bound to eth0), ethernet address.
Thanks.
--
--Be a free spirit or a slave to M$? It's your choice!
--http://members.xoom.com/dizhao,[EMAIL PROTECTED]
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
From: [EMAIL PROTECTED] (Arthur Merar)
Subject: Link Question
Date: Thu, 03 Jun 1999 22:31:35 GMT
Hello,
I am a bit new to Linux. I have Jet Admin for Linux and I want to
install it. However, it is sitting on my Windows box. How can I
create a link from my Linux box through my network to my Windows box
so I can get this archive?
Please send e-mail.....thanks
Arthur
[EMAIL PROTECTED]
------------------------------
From: "Ian" <[EMAIL PROTECTED]>
Subject: Re: Need help getting networking running
Date: Fri, 4 Jun 1999 11:24:55 +1200
There is a dhcp client process.
I think it's called dhcpcd. Have a look at the man pages to get you started.
man dhcpcd
Ian
Jason Heltne wrote in message ...
>I recently installed Red Hat Linux 6.0 on a Compaq Deskpro 4000 166 w/ 32mb
>memory, Compaq Netflex3p network card. I cannot get networking to work
>using DHCP. First off, is this possible to do, secondly, how do I go about
>doing this. I am new to Unix so any help would be greatly appreciated.
>
>
------------------------------
From: Robin Munn <[EMAIL PROTECTED]>
Crossposted-To: comp.protocols.ppp
Subject: Re: Win95->Linux PPP can't see past subnet
Date: Wed, 02 Jun 1999 16:26:42 GMT
In article <7hsc60$k0f$[EMAIL PROTECTED]>,
Robin Munn <[EMAIL PROTECTED]> wrote:
[a long description of my problem]
It's fixed now. To those of you who helped me, thanks a lot. It turned
out that my PPP setup was entirely correct (IP forwarding turned on,
proxyarp in the PPP options, etc.). My problem was with routing in
general; specifically, with not understanding the way routing is set up
here at our network. Once I changed thorn's default gateway from
a.b.64.1 (where it had been pointed) to a.b.65.1 (the router for the
a.b.65.0/24 subnet), everything started working: winbox could ping sites
outside the a.b.65.0/24 subnet and could even ping Internet sites. Web
pages were visible via Netscape, the works: I had an Internet connection
via PPP. What is really surprising about this whole business isn't that
winbox was NOT able to see "outside" sites, but that thorn WAS.
To summarize what I needed to do to get thorn working as a PPP server:
Install mgetty (its AutoPPP feature is very nice for Win9x clients)
Recompile the kernel to include IP forwarding and PPP support
Check that I had the right version of pppd (see the PPP-HOWTO for this)
Set up the pppd options to include proxyarp
*** Get the routing correct on thorn! :-} ***
Create a Dial-Up Networking connection on winbox
It was really fairly simple once I figured out the routing problem.
Which I really *should* have clued to about a week ago... I will now
find a small, tiny, microscopic hole to go hide in. :-)
Anyway, thanks to those who helped.
--
Robin Munn (Legal name: Robert A. Munn)
[EMAIL PROTECTED]
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
From: "Tim Cairl" <[EMAIL PROTECTED]>
Subject: $SOCKS_N Environment
Date: Thu, 3 Jun 1999 18:22:31 -0400
I am trying to implement linux in our corporate lan and do away with NT.
Currently I am able to print to our print servers, and access ant internal
device. However, when I try to go to external devices (DNS, ISP, or any
WWW) I get the $SOCKS Environment error. I have a technologics firewall
setting between my cisco 3640 and our 120 pc lan. Is there a possibility
that my Firewall is stopping ICMP? Did i forget to dot an I or Cross a t in
my networking configuration? Would appreciate any insight to my inquirery.
------------------------------
From: "Benjamin Walling" <[EMAIL PROTECTED]>
Subject: Getting Linux through MS Proxy Server?
Date: Thu, 03 Jun 1999 23:30:35 GMT
I have an NT box with MS Proxy Server 2.0 running on it. I have set up
Netscape on my linux box to get out through it (Netscape has internal proxy
settings). How can I get the rest of the box to 'see' out (ping, ftp, other
apps, etc)? The NT box has two nics - one to my cable modem with a static
real ip address, one to a hub with 10.x.x.x address. The linux box has a
10.x.x.x address. I can ping both nics in the NT server, but nothing past
it. There has got to be some setting somewhere -- does anyone know what it
is????
Thanks for any help!!
Benjamin Walling
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: Microsoft Exchange
Date: Wed, 02 Jun 1999 21:11:01 GMT
In setting up a exchange client there is lots of additional info such
as the domain, besides the server, mailbox id, and password. is any of
this info required when setting up a pop client and where does it go?
TIA
In article <7igsmp$nqb$[EMAIL PROTECTED]>,
[EMAIL PROTECTED] wrote:
> Hi!
>
> If you just want to get your mail via an Exchange Server use a mail
> client with pop3 and smtp support (i.e. Netscape, xfmail, pine). Other
> servies of the Exchange server like public folders can�t be used. (as
> far as I know).
>
> S. Alpers
>
> In article <[EMAIL PROTECTED]>,
> bb <[EMAIL PROTECTED]> wrote:
> > Hi there
> >
> > I'm using RH5.2 / 2.2.6 / KDE and all is working except for my Mail.
> >
> > Is anybody using a linux mail client to connect to a Microsoft
> Exchange
> > Server ?
> > If so , which is the best one to use ? (besides scrapping the
> Microsoft
> > beast :) )
> >
> > Thanks
> > Cheers
> > bb
> >
> >
>
> --== Sent via Deja.com http://www.deja.com/ ==--
> ---Share what you know. Learn what you don't.---
>
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: Forwarding of broadcasts possible?
Date: Thu, 03 Jun 1999 21:28:09 GMT
In article <[EMAIL PROTECTED]>,
Steve Davidson <[EMAIL PROTECTED]> wrote:
> "Levent G�ndogdu" wrote:
> > I have set up a linux box to connect two intranet subnets with
> > the ip ranges 192.168.0.* and 192.168.1.*, each with a netmask of
> > 255.255.255.0. The routing between those subnets works fine.
> > I am running services on the computers on the subnets that try to
> > find other services via issuing a broadcast on a specific udp port.
> > Everything works fine within a subnet but the broadcast is never
> > seen on the other subnet. Is there a possibility to forward
> > broadcasts on a specific port to the other subnet?
> Why not send the broadcast using address 192.168.255.255? The
> broadcast should reach all listeners in the 192.168 network. It's been
> a while since I've done this, but it should work.
Most gateways are not, by default, configured to forward broadcast
packets. If they were, imagine what would happen if you sent a
broadcast to 255.255.255.255.
Try `man gated` [or whatever routing software you're using] and look for
'broadcast' and/or 'forwarding'.
--
-Bill Clark
Systems Architect
ISP Channel
http://locale.ispchannel.com/
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
From: "Bob Rakov" <[EMAIL PROTECTED]>
Subject: Re: Dial On Demand on RH6.0
Date: Thu, 03 Jun 1999 13:24:36 GMT
In article <7j5j46$anf$[EMAIL PROTECTED]>, "twinson"
<[EMAIL PROTECTED]> wrote:
> Has anybody configured diald (or any other dial-on-demand daemon)
> successfully on RH6.0 (kernel 2.2.5)?
>
I find using the demand option (entered in the options file) for pppd the
easiest for me. Less complicated than having to run the diald program.
Check out:
http://www.nic.com/~cannon/Linux/index.htm
For details. Works well for me!
-bob
------------------------------
From: Chiyu Wang <[EMAIL PROTECTED]>
Subject: Turn off messages on the screen?
Date: Thu, 03 Jun 1999 16:02:45 -0500
Hello,
I installed Redhat 6.0. The messages of the chat process keep showing on
the screen (attached as below). This is really annoying. My Redhat 5.2
does not have this. Can anyone tell how this can be turned off?
Thanks,
Chiyu
==============================
Serial connection established.
Using interface ppp22
Connect: ppp22 <--> /dev/ttyC8
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xe517b8b8> <pcomp>
<accomp>]
rcvd [LCP ConfReq id=0xa <asyncmap 0xa0000> <auth chap MD5> <magic
0xb0d7c833> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa <asyncmap 0xa0000> <auth chap MD5> <magic
0xb0d7c833> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xe517b8b8> <pcomp>
<accomp>]
rcvd [CHAP Challenge id=0x8 <51ef269f16a99ee41f2e1cff3a2de7d2>, name =
"ISP-server"]
sent [CHAP Response id=0x8 <60c134fb87a0acad817210023f5d63df>, name =
"ISP3-client"]
rcvd [CHAP Success id=0x8 ""]
sent [IPCP ConfReq id=0x1 <addr 2.2.2.2> <compress VJ 0f 01>]
rcvd [IPCP ConfReq id=0x1d <addr 1.1.1.1>]
sent [IPCP ConfAck id=0x1d <addr 1.1.1.1>]
rcvd [proto=0x8207] 01 1c 00 04
Unsupported protocol (0x8207) received
sent [LCP ProtRej id=0x2 82 07 01 1c 00 04]
rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x2 <addr 2.2.2.2>]
rcvd [IPCP ConfReq id=0x1e <addr 1.1.1.1>]
sent [IPCP ConfAck id=0x1e <addr 1.1.1.1>]
rcvd [proto=0x8207] 01 1d 00 04
Unsupported protocol (0x8207) received
sent [LCP ProtRej id=0x3 82 07 01 1d 00 04]
rcvd [IPCP ConfAck id=0x2 <addr 2.2.2.2>]
default route ioctl(SIOCADDRT): File exists(17)
local IP address 2.2.2.2
remote IP address 1.1.1.1
Script /etc/ppp/ip-up started; pid = 28518
Script /etc/ppp/ip-up finished (pid 28518), status = 0x0
------------------------------
From: David Lewis <[EMAIL PROTECTED]>
Crossposted-To: comp.mail.sendmail,alt.os.linux.slackware
Subject: Re: What is this for?!?!
Date: Thu, 03 Jun 1999 08:32:06 -0500
Got it, that explains it. I have had it happen with a couple of users once
each. But with one user it happens every time. Anybody know why that
would be happening?
Brian wrote:
> It is the lockfile for POP3 mail files.
>
> It prevents mail files from being destroyed during
> simultaneous upload/download. On occasion, W95/8 mail
> systems do not complete the mail download and the lock stays
> in place, preventing further download. Just delete the lock
> file and all will be well, until the next time.
>
> Best regards,
>
> Brian
>
> David Lewis wrote in message
> <[EMAIL PROTECTED]>...
> >The files in /var/tmp/.pop. Sometimes, not always, when a
> user gets his
> >email via POP3. It puts a file with his username on it in
> that directory.
> >The file contains his messages. On the client end, the
> check locks up and
> >he never gets anything.
> >
> >What is that directory for?
> >Why is he not getting anything?
> >
> >
> >
> >--
> >1+ residential LD, 6.9 cents - http://LD.net/6.9/dlewis
> >
> >
--
1+ residential LD, 6.9 cents - http://LD.net/6.9/dlewis
------------------------------
From: norman elliott <[EMAIL PROTECTED]>
Subject: Re: autodial for IP masq
Date: Fri, 04 Jun 1999 00:25:45 +0000
Greg wrote:
> This question is for Norm,
> Norm is there a way or have you figured out a way to set the idle timer
> for diald i.e when the connection is idle it disconnects here in about
> 8 minutes, idle 0 does not work in the options and idle 0 in the diald
> script is un-recognized. I really haven't found anything in the docs to
> cover this other wise diald does a great job..
>
> thanks in advance, Greg.
>
> -> . I have been using it on a 486 which
> > allows
> > my Pentium Linux PC and my Pentium Win95 PC to connect on demand for
> > about 5 months now.
> > hope this helps,
> > best wishes,
> > norm
> >
> >
Not sure what you are trying to do here Greg.
If you do not want to drop the connection at all then probably you do not
want diald.
If you want a shorter idle time then in your diald.conf file include a line
which says something like
impulse 60,0,0
this will allow 60 seconds of idle time before the connection is dropped
by diald.
If you want different idle times depending on the day of the week or
the time of day or combinations of the same then you need to look
at adding some bits to the
/usr/lib/diald/standard.filter
file diald also refers to.
man diald
gives help with this.
best wishes,
norm
------------------------------
From: [EMAIL PROTECTED] (Kevin Martin)
Subject: Re: Before I screw up the internet....
Date: Thu, 03 Jun 1999 13:30:53 GMT
In article <01beadb0$110d82a0$0101a8c0@george>, it says "George Georgakis"
<linuxstart.com@geegee> wrote:
>OK, you've got the wrong idea :)
>
>Most likely people didn't respond to your query because it has been
>answered thousands of times in the past.
Or because we saw ALL THREE of his posts at the same time -- this isn't AOL
"Instant Messaging" here. When you ask a question, Christopher, it's not
unusual to get the answer somewhere between one and three DAYS later.
>Check it out - when you're connected to your ISP, type "ifconfig" to see
>your interface configurations. Then try ifconfig again with ppp not
>connected.
Nice answer, George -- better than he deserved.
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: nmap kills my interface!
Date: Wed, 02 Jun 1999 21:52:05 GMT
A little something to add - even if I don't scan with nmap, the
interface will still die after a period of time. about 10 seconds, in
fact when using tcpdump. Restart it (ipconfig eth0 down, ipconfig eth0
up) and all is well again. It seems to last longer if I don't use it
for anything. As soon as I run tcpdump to listen for traffic, it dies
in < 10 S, no errors, just quits.
FF
In article <7j46us$to9$[EMAIL PROTECTED]>,
[EMAIL PROTECTED] wrote:
> I have a box with two adapters, [EMAIL PROTECTED]/24 (3c509) and
> [EMAIL PROTECTED]/32 (realtek ne2000 pci). eth0 is connected to our lan,
> eth1 to nothing at the moment, but soon to a DSL router.
>
> When I use nmap (from another Linux box) to scan 192.168.0.201, the
> interface goes dead. I can still ping it from the box itself, but it
> cannot ping other PC's, and other PC's can no longer ping it. If I use
> UserNet to restart eth0, it works again until I hit it with nmap. I'm
> using nmap 2.2beta4-1 with the included GUI to perform the scan.
> Settings are the startup defaults, SYN Stealth, TCP & ICMP, OS
> Detection (nmap -sT -O 192.168.0.201)
>
> Am I inadvertantly executing a DOS attack on my own server?
>
> Help please..
>
> Also, thanks to those responding to my earlier firewall/masquerading
> post.
>
> FF
>
> Sent via Deja.com http://www.deja.com/
> Share what you know. Learn what you don't.
>
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
From: "Adam C. Emerson" <[EMAIL PROTECTED]>
Subject: Re: Telnet using "root"
Crossposted-To: comp.os.linux,comp.os.linux.setup,hk.comp.os.linux,tw.bbs.comp.linux
Date: Thu, 03 Jun 1999 23:47:15 GMT
In comp.os.linux.networking Fong's <[EMAIL PROTECTED]> wrote:
> Can "root" to telnet and login?
> I fail to login by root, but other account is ok..
There's a whole other thread in c.o.l.m about this, take a look
in there. You'll learn everything from ssh to the wonders of
tcp-wrappers.
--
Adam C. Emerson [EMAIL PROTECTED]
http://www.calvin.edu/~aemers19/
Preach from it unto the Righteous, that they may renounce their
ways and repent. -- Honest Book of Truth
------------------------------
From: "Peter" <[EMAIL PROTECTED]>
Subject: HOW TO change reported IP ???
Date: Thu, 03 Jun 1999 13:36:45 GMT
is there a way to do fakeIP in linux ???
tia
------------------------------
From: "Adam C. Emerson" <[EMAIL PROTECTED]>
Subject: Re: How can I tell if it is Linux?
Date: Thu, 03 Jun 1999 23:50:32 GMT
David Murray <[EMAIL PROTECTED]> wrote:
[ Reformatted for width ]
> Is there anyway to tell if a specific web server is running Linux, or
> even Apache for that matter? What if it isn't a web server.. just a
> workstation or file server, is there anyway to determine that it is
> running linux?
> Obviously I could try to telnet to it, but assuming they aren't
> running inetd... How could I tell?
To find out the webserver being used, do a head request (] in lynx).
To find out the operating system, get queso or nmap.
--
Adam C. Emerson [EMAIL PROTECTED]
http://www.calvin.edu/~aemers19/
Preach from it unto the Righteous, that they may renounce their
ways and repent. -- Honest Book of Truth
------------------------------
From: DonJr <donjr@[127.0.0.1]>
Crossposted-To: onenet.adsl,onenet.linux,comp.os.linux.setup,comp.dcom.xdsl
Subject: Re: linux ADSL setup - name resolution problem
Date: Thu, 03 Jun 1999 19:16:34 -0400
Ausias wrote:
>
> <snip>
> >...now if I can just find a way to get my logitech wheelmouse
> >wheel working in linux...
> <snip>
>
> I have a Logitech mouseman+ w/ wheel (PS/2) and the wheel works if you put
> the cursor in the scroll box area of the window. Even then, it only works
> for certain windows.
Get the package:
imwheel-0.9.6-2.i386.rpm
And follow it's setup instructions. Work Great. You can scroll the
window with wheel anywhere in the windon. I didn't even have to tweak
it's init file that lets you customize it for each application.
--
-----------------------
Don E. Groves, Jr.
my Email is jetnick AT erols DOT com
I'll add a witty saying here later.
================
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: Port numbers
Date: Wed, 02 Jun 1999 18:46:57 GMT
In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (Mark Lagace) wrote:
> Does a list of port numbers exist anywhere?
/etc/services
--
-Bill Clark
Systems Architect
ISP Channel
http://locale.ispchannel.com/
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
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End of Linux-Networking Digest
******************************
