Linux-Networking Digest #686, Volume #11 Sun, 27 Jun 99 01:13:38 EDT
Contents:
Re: IP Masquerade newbie (lyte)
Maximum throughput via a 16bit PCMCIA 100MB Ethernet card (Brian Hall)
If I had a gun.... ("James R. Barnett, Jr.")
ftp & telnet,connection refused (Joshua Krawitz)
Netscape, POP3 server, DNS (George Lane)
Re: What are these "Something Wicked happened!" messages (lyte)
Re: Administrative accounts (Mike Hale)
Re: NIC problems (lyte)
Re: Strange UUCP chat problem (Ian Lance Taylor)
Re: Why not C++ (Bruce Hoult)
Re: Why not C++ (Bruce Hoult)
Re: 10BASE-T NIC and 100mbps NIC to a dual-speed hub doesn't work? (Todd Knarr)
Re: multiple ethernet 3c509 cards (Kurt Sims)
Re: Why not C++ (Bruce Hoult)
Re: 192.168/16 vs. 10/8 (Todd Knarr)
----------------------------------------------------------------------------
From: lyte <[EMAIL PROTECTED]>
Subject: Re: IP Masquerade newbie
Date: Sat, 26 Jun 1999 23:13:56 -0400
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Pedro Duque wrote:
> Help!!!
>
> can i use ip masquerade to make a 1:1 ip mapping between two networks? how?
>
> What i want to do is to map some machines (like 194.24.1.0/24) to look like
> they have a diferent ip on other network (like 192.168.13.0/24) but keeping
> the initial ip on the netwok where they are connected.
>
> 1 2 3 4
> +---------+---------X----------+
>
> 1 - my machine
> 2 - see 1 as having the ip 194.24.1.15
> 3 - Linux box?!
> 4 - see 1 as having the ip 192.168.13.3
>
> Is this possible?!
>
> --
> **** God is Real, unless declared Integer ****
Check out our little IP Masquerading guide located at
http://www.thecomputergallery.com/redhat/ipmasq.shtml
It should help you get started.
Best of luck.
--
Joey Olson
#RedHat OnLine
http://www.thecomputergallery.com/redhat
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Pedro Duque wrote:
<blockquote TYPE=CITE>Help!!!
<p>can i use ip masquerade to make a 1:1 ip mapping between two networks?
how?
<p>What i want to do is to map some machines (like 194.24.1.0/24) to look
like
<br>they have a diferent ip on other network (like 192.168.13.0/24) but
keeping
<br>the initial ip on the netwok where they are connected.
<p>1
2
3
4
<br>+---------+---------X----------+
<p>1 - my machine
<br>2 - see 1 as having the ip 194.24.1.15
<br>3 - Linux box?!
<br>4 - see 1 as having the ip 192.168.13.3
<p>Is this possible?!
<p>--
<br>**** God is Real, unless declared Integer ****</blockquote>
Check out our little IP Masquerading guide located at <A
HREF="http://www.thecomputergallery.com/redhat/ipmasq.shtml">http://www.thecomputergallery.com/redhat/ipmasq.shtml</A>
<br>It should help you get started.
<br>Best of luck.
<pre>--
Joey Olson <[EMAIL PROTECTED]>
#RedHat OnLine
<A
HREF="http://www.thecomputergallery.com/redhat">http://www.thecomputergallery.com/redhat</A></pre>
</html>
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------------------------------
From: [EMAIL PROTECTED] (Brian Hall)
Subject: Maximum throughput via a 16bit PCMCIA 100MB Ethernet card
Date: Sun, 27 Jun 1999 03:20:56 GMT
Reply-To: [EMAIL PROTECTED]
What is the maximum throughput of a 16bit PCMCIA 100MB Ethernet card? I
know it is limited by the speed of the PCMCIA slot but I can't find the
number.
------------------------------
From: "James R. Barnett, Jr." <[EMAIL PROTECTED]>
Subject: If I had a gun....
Date: Sat, 26 Jun 1999 22:31:41 -0500
Okay, I am sure some of you have seen my posts in the past weeks. I am
at my wits' end trying to set up a 2 machine network. Many of you have
tried to help and I appreciate it, but nothing has worked so far. I have
installed Win98 on both machines to ensure that the Ethernet Card,
cables and hub were all functional. It worked in about 15 minutes. I
bought the Book 'Linux Network Toolkit and followed the first two
chapters exactly (which setup a Samba Server with windows client). I
still cannot ping between the machines. The network cards went in fine
during the Linux install. The modules loaded correctly with the
autoprobe. cat proc/interrupts and cat proc/ioports both show the
ethernet card is using the expected resources. ifconfig shows that eth0
is up and running. My routing tables match exactly what is in the book.
What on earth could I being doing wrong. If I didn't know better, I
would think the hub didn't handle linux packets but I know that is
ridiculous. Any one have any ideas? I am desperate and frustrated. I
would be forever grateful to anyone who could help me get this working.
Replies by email are more than welcome.
JamesB
------------------------------
From: Joshua Krawitz <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Subject: ftp & telnet,connection refused
Date: Sun, 27 Jun 1999 02:51:35 GMT
hi,
If any body has has any info on how to solve the problem with
RedHat's new 6.0's networking problems I would be very greatful.
I have 3 computers, one was upgraded from 5.2 to 6.0 and all the others
were installed fresh with 6.0. When attempting to ftp or telnet into
the newly installed RH 6.0 pcs I recieve a connection refused mesage
from either program. The /etc/hosts file has all computers present on
the network. The hosts.deny and hosts.allow files have been altered
check and then checked again. I can ftp FROM any of the computers to an
old 5.2 machine with no trouble but the 5.2 or the other 6.0 machines
cannot be ftped into. I can start the daemon manually but this makes no
differeince. Now here comes the kicker. I can ping to any machine from
any machine successfully with 0% packet loss. I can also tftp into any
machine and NFS is working perfectly as well. I get no errors during
boot up or in any of the log files. However the upgraded computer (5.2
to 6.0) doesn't suffer any of these problems. but I needed to have the
new 2.2 SMP kernel and the only way the setup program will install it is
with a clean install. Ironically I used the ftp setup with a cdrom
drive from another server to install many of the fresh copies and it
worked perfectly.
Why am I getting these connection refused errors. I have all ftp files,
or at least in.ftpd, out.ftpd, etc ...
the ftp program is function but servce is being denied to me? Anybody
have a clue?
Thanks, Joshua
------------------------------
From: [EMAIL PROTECTED] (George Lane)
Subject: Netscape, POP3 server, DNS
Date: Sun, 27 Jun 1999 03:32:40 GMT
Reply-To: [EMAIL PROTECTED]
I haven't been able to find any information about this issue, so I
thought I'd try here..
I have a Linux box running sendmail 8.8.7, imap-4.4-2, and diald, that
I use as a firewall/router/mail server. It dials up and downloads my
e-mail from my ISP just fine. I'm also able to access the Internet
(using IP masquerading) from my other computers when the server is
dialed up.
The problem: When the server is not dialed up and I try to fetch the
downloaded messages from my server, using Netscape Navigator 4.08
running on a Linux workstation. Clicking Messenger Mailbox to download
the messages, Netscape connects to my server, but it also seems to
generate some type of DNS request, because my server dials up the ISP,
thus defeating the purpose of having the server in the first place :)
After the server connects, the messages get downloaded as intended.
Netscape Navigator 3.04, on my Windows 95 box, doesn't have this
problem, nor does the Windows 95 e-mail client.
I'm not sure if this is relevant, but all 3 machines have the names
and addresses of the other machines in their hosts files. The
host.conf file on the server reads:
order hosts, dns
multi on
Is this a simply a name resolution problem or is this an eccentricity
of this version of Netscape Navigator? It's not a major problem, but
quite annoying. Any suggestions would be appreciated.
George Lane
Atlanta
------------------------------
From: lyte <[EMAIL PROTECTED]>
Subject: Re: What are these "Something Wicked happened!" messages
Date: Sat, 26 Jun 1999 23:19:56 -0400
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Mohamad Kaissi wrote:
> > I'm using the 2.2.5 kernel that comes with RedHat 6.0 and everynow and
> then I
> > see a series of these messages:
> >
> > eth1: Something Wicked happened! 000a
> Sorry, have no clue what those mean, but just an FYI. I think that kernels
> that end with an odd number, like .5, are not stable. Try n' get a stable
> one and compile it.
whatever number then end in does NOT determine if they are stable. It is the
second digit of the kernel that will determine a stable kernel or not. ie:
2.1.x is NOT stable (x.1.x is odd)
2.2.x is Stable (x.2.x is even)
so therefor 2.2.1 2.2.3 2.2.5 etc would be stable.
just like how now the 2.3.x is not stable and currently in development.
Cheers.
--
Joey Olson
#RedHat OnLine
http://www.thecomputergallery.com/redhat
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Mohamad Kaissi wrote:
<blockquote TYPE=CITE>> I'm using the 2.2.5 kernel that comes with RedHat
6.0 and everynow and
<br>then I
<br>> see a series of these messages:
<br>>
<br>> eth1: Something Wicked happened! 000a
<br>Sorry, have no clue what those mean, but just an FYI. I think that
kernels
<br>that end with an odd number, like .5, are not stable. Try n' get a
stable
<br>one and compile it.</blockquote>
whatever number then end in does NOT determine if they are stable. It is
the second digit of the kernel that will determine a stable kernel or not.
ie:
<p>2.1.x is NOT stable (x.1.x is odd)
<br>2.2.x is Stable (x.2.x is even)
<br>so therefor 2.2.1 2.2.3 2.2.5 etc would be stable.
<br>just like how now the 2.3.x is not stable and currently in development.
<br>Cheers.
<br>
<pre>--
Joey Olson <[EMAIL PROTECTED]>
#RedHat OnLine
<A
HREF="http://www.thecomputergallery.com/redhat">http://www.thecomputergallery.com/redhat</A></pre>
</html>
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------------------------------
From: Mike Hale <[EMAIL PROTECTED]>
Subject: Re: Administrative accounts
Date: Sun, 27 Jun 1999 02:52:06 GMT
Where can I find this info about sudo?
In article <[EMAIL PROTECTED]>,
Matt Templeton <[EMAIL PROTECTED]> wrote:
> you might look at setting up sudo
>
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
From: lyte <[EMAIL PROTECTED]>
Subject: Re: NIC problems
Date: Sat, 26 Jun 1999 23:15:46 -0400
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Toky wrote:
> Anybody out there has gotten a d-Link NIC working under RH 6?
Sure have. Just recompile the kernel with D-Link support in the
networking section. For information on how to recompile the kernel check
out http://www.thecomputergallery.com/redhat/kernel.shtml
Best of luck.
--
Joey Olson
#RedHat OnLine
http://www.thecomputergallery.com/redhat
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Toky wrote:
<blockquote TYPE=CITE>Anybody out there has gotten a d-Link NIC working
under RH 6?</blockquote>
Sure have. Just recompile the kernel with D-Link support in the networking
section. For information on how to recompile the kernel check out <A
HREF="http://www.thecomputergallery.com/redhat/kernel.shtml">http://www.thecomputergallery.com/redhat/kernel.shtml</A>
<br>Best of luck.
<br>
<pre>--
Joey Olson <[EMAIL PROTECTED]>
#RedHat OnLine
<A
HREF="http://www.thecomputergallery.com/redhat">http://www.thecomputergallery.com/redhat</A></pre>
</html>
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------------------------------
From: [EMAIL PROTECTED] (Ian Lance Taylor)
Crossposted-To: comp.mail.uucp
Subject: Re: Strange UUCP chat problem
Date: 27 Jun 99 01:56:51 GMT
[EMAIL PROTECTED] (Chris Huston) writes:
>Now, without making ANY changes to the system, I rerun uucico with
>debugging on
> "/sbin/uucico -f -r1 -s remote -x9"
>and it works fine...
This normally means that you need to sprinkle a few delays into your
chat script. uucico runs slower with debugging turned on.
--
Ian Taylor | [EMAIL PROTECTED] | First to identify quote wins free e-mail message:
``The big lie of American capitalism is that corporations work in their
own best interests. In fact they're constantly doing things that will
eventually bring them to their knees.''
------------------------------
From: [EMAIL PROTECTED] (Bruce Hoult)
Crossposted-To: comp.os.linux.development.apps,comp.os.linux.development.system
Subject: Re: Why not C++
Date: Sun, 27 Jun 1999 16:15:49 +1200
In article <7l33sf$c0f$[EMAIL PROTECTED]>, [EMAIL PROTECTED]
(Nathan Myers) wrote:
> Bruce Hoult <[EMAIL PROTECTED]> wrote:
> > "Thomas Steffen" <[EMAIL PROTECTED]> wrote:
> >> apart from that, C++ might not be a very elegant language, but it is
> >> fast. at least compared to other OO languages. and still has about
> >> every feature you can expect.
> >
> >You might want to check out Dylan. It's much simpler and easier to learn
> >than C++, and yet is more powerful than C++ ...
> > Plus Dylan is designed to be as fast as C++. ...
> > Dylan is much better than C++ and Java.
>
> Nonsense. If you think Dylan is as fast as C++, you really
> don't know C++ at all, and should know better than to compare
> the languages so glibly. Anyway, this is not a languages list.
Sorry, but you're wrong. I've been using C++ professionally since 1989,
and love it. Employers and co-workers generally consider me to have well
above average knowledge of C++. I know the features of C++. I know how
they are implemented under the covers. I know the limitations. I know
what is fast and what is slow.
Dylan is better.
-- Bruce
------------------------------
From: [EMAIL PROTECTED] (Bruce Hoult)
Crossposted-To: comp.os.linux.development.apps,comp.os.linux.development.system
Subject: Re: Why not C++
Date: Sun, 27 Jun 1999 16:20:15 +1200
In article <7l3950$5jg$[EMAIL PROTECTED]>, [EMAIL PROTECTED]
(Nathan Myers) wrote:
> Thomas Steffen <[EMAIL PROTECTED]> wrote:
> > C++ might not be a very elegant language, but it is
> >fast, at least compared to other OO languages.
>
> Its syntax isn't very elegant, but where did that come from?
> It's fast compared to _any_ language, period. People who say
> it's slower than (e.g.) C are just spreading FUD.
Now this I agree with.
If you have a reason to use the advanced feaures of C++ (e.g. virtual
functions) then you'd need to do something similar manually in C and your
resulting C code will be either the same speed as the C++, or will
sometimes even be slower because you can't efficiently express some things
in C that the C++ compiler can express in assembler.
Exactly the same applies to a C++/Dylan comparison.
-- Bruce
------------------------------
From: Todd Knarr <[EMAIL PROTECTED]>
Subject: Re: 10BASE-T NIC and 100mbps NIC to a dual-speed hub doesn't work?
Date: 27 Jun 1999 04:23:27 GMT
Rod Smith <[EMAIL PROTECTED]> wrote:
> I'm interested in finding out more about the features and capabilities of
> hubs and switches -- not so much specific brand recommendations as just
> general information that could be used to evaluate them in the future. Is
> there a FAQ on this topic, or a section of some other FAQ devoted to it?
> A manufacturer's web site with more than smokescreen marketing babble?
I'm not sure of a FAQ, beyond general Ethernet technical texts, but
someone will probably chime in with one. There's a good selection of
FAQs at ftp://rtfm.mit.edu/pub/ if you want to browse through there.
The main difference from a user's POV between a hub and a switch is in
where the packets go. On a hub, any packet that comes in any port is
sent back out all ports except the one it came in on. A switch watches
for which Ethernet hardware (MAC) addresses send packets in through which
ports and builds a table of which MAC addresses are attached where. When
a packet comes in, the switch looks at the MAC address it's being sent
to and, if the address is in the table, only sends the packet out the
port that MAC address can be reached through.
--
Collin was right. Never give a virus a missile launcher.
-- Erk, Reality Check #8
------------------------------
Date: Sun, 27 Jun 1999 00:07:30 -0400
From: Kurt Sims <[EMAIL PROTECTED]>
Subject: Re: multiple ethernet 3c509 cards
I'm having a similar (but different) problem. I, too, have dual 3c509
cards.
You need to set the base address and irq in the card's EEPROM.
Boot the computer in DOS and run the setup utility and manually change
those settings on one of the cards (I have one with 10,0x300 and one
with 11,0x210). Hope that helps.
My problem is that I can't get linux 2.0.35 to see the second card:
I get a "modprobe: can't locate module eth1" error. I can get each card
running individually, just not together.
My conf.modules file looks like this:
alias eth0 3c509
alias eth1 3c509
options eth0 io=0x210 irq=11
options eth1 io=0x300 irq=10
My ifcfg-eth0 and ifcfg-eth1 (of course the device and ipaddr are
different)
files look like this:
DEVICE=eth0
IPADDR=192.168.0.2
NETMASK=255.255.255.0
NETWORK=192.168.0.0
BROADCAST=192.168.0.255
ONBOOT=yes
I've added append="ether=11,0x210,eth0 ether=10,0x300,eth1" to my
lilo.conf file.
Sorry for dumping a new problem into an existing thread, but it seemed too
familiar to ignore. I've read all the man pages, HOW-TOs and postings I
can find,
and have tried every combination of the above I can think of, but this one
is really ticking me off.
kds
David Brode wrote:
> I'm having difficulty installing a second 3c509 card.
>
> Without the second card, I can boot just fine & ping my gateway, and
> indeed resolve names & ping the world. When the second card is
> seated, I can't ping beyond my own box. The boot message with both
> cards seated indicates that both cards are at IRQ=10 and at 0x300, but
> the first is 0x300 tag 1 and the second is 0x300 tag 2. Is this my
> problem? I'm guessing that I can't have two cards at the same IRQ and
> address, but I can't figure out how to change it.
>
> I've tried
>
> 1. Editing /etc/lilo.conf where I added two lines at the end with
>
> ether=0,0,eth0
> ether=0,0,eth1
>
> (One document I read said I shouldn't give it the address but the 0's
> would force the probe to choose good addresses.)
>
> Things got hosed completely. I couldn't ping my gateway. I looked up
> a few mins later & got a message continuously displaying saying:
> "eth0: Infinite loop in interrupt, status 2001." and even Ctrl-Alt-Del
> wouldn't work.
>
> 2. Editing /etc/conf.modules where I added:
>
> alias eth0 3c509
> alias eth1 3c509
> options 3c509=0x300,0x280
>
> and the result was being hosed.
>
> I've been pouring over the Ethernet HOWTO and the NET-3 HOWTO and
> Donald Becker's Multiple Ethernet mini HOWTO, etc. but I can't figure
> out the next step.
>
> Any ideas?
>
> tia
------------------------------
From: [EMAIL PROTECTED] (Bruce Hoult)
Crossposted-To: comp.os.linux.development.apps,comp.os.linux.development.system
Subject: Re: Why not C++
Date: Sun, 27 Jun 1999 16:30:00 +1200
In article <[EMAIL PROTECTED]>, Johan Kullstam
<[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] (Nathan Myers) writes:
>
> > Thomas Steffen <[EMAIL PROTECTED]> wrote:
> > > C++ might not be a very elegant language, but it is
> > >fast, at least compared to other OO languages.
> >
> > Its syntax isn't very elegant, but where did that come from?
> > It's fast compared to _any_ language, period. People who say
> > it's slower than (e.g.) C are just spreading FUD.
>
> C++ *is* slower than C. not by orders of magnitude or even a factor
> of two, but if you feed code to both C and C++ compilers, the C
> compiler will optimize harder and generally make a better product.
> this is because C is more mature and that C++ code is potentially more
> complex which causes a more conservative compile.
I'd love to see an example of this.
Given...
1) code that is both valid C and valid C++, and
2) a C++ compiler that compiles to C (e.g. AT&T CFront)
... you will end up with identical machine code, no matter whether you
compile with the C compiler, or compile with the C++ compiler (using the
same C compiler as the back end).
You may be able to find some particular C++ compiler that produces worse
code compiling a C program than some particular C compiler, but that is a
function of the compiler, not the language.
> on the other hand, common-lisps like CMUCL can acheive near C or
> fortran execution speed. speed is not exclusively the domain of the
> C-like languages.
I agree. The biggest problem with this is that Common Lisp is limited by
things such as the lack of type (and other) declarations which would
otherwise allow the compiler to generate even better code in many
situations. Dylan is much like Lisp, but has (optional) declarations of
all sorts of things to aid program correctness and compiler optomisation.
CMU Dylan (aka Gwydion Dylan, aka d2c) does the same sort of optomisations
as CMUCL, and more.
-- Bruce
------------------------------
From: Todd Knarr <[EMAIL PROTECTED]>
Subject: Re: 192.168/16 vs. 10/8
Date: 27 Jun 1999 04:44:38 GMT
[EMAIL PROTECTED] wrote:
> Networks aren't in "classes" any longer, and haven't been for roughly a
> decade. 10.x.y/24 is the same as 192.168.z/24 in every conceivable way,
> except that addresses from the first net are capable of being part of
> much larger super-nets than those from the second.
True, but a lot of people still have addresses that fit into the old
class A/B/C system. I generally use "class C" to mean "A /24 network
in the range originally assigned to class C network numbers". Ie. the
192.168.171.x network would be class C, 10.56.143.x would not be.
I tend to keep subnetting to byte boundaries a certain amount of the time,
since that gives me IP addresses where the subnet parts can be read straight
out of the dotted-quad form easily. This does lead to the "class" terms
being useful, since they correspond directly to where the boundary lies.
> I'd love to see the company that "needs" 16.7 million IP addresses. /8
Leading octet 10.
Second octet indicating physical building, 1-3.
Third octet indicating segment within the building.
Fourth octet indicating host on the segment.
Works well, since logical departments coincide well with physical
network segments. Requires enough room to subnet on byte boundaries.
Note that in this case "need" is driven more by the need for convenience
for the netadmins than anything else.
My rule is to use class C ( /24 ) on networks that won't need subnetting
for routing, class A ( /8 ) or something else largish on networks that
do ( or conceivably may in the future ) need subnetting. Home networks
typically don't need subnetting, and if they do they're typically owned
by people who know what subnetting is and why they're going to need it.
> That's an excellent point. 172.16/12 [which is what you mean -- "class
> B" no longer exists] *is* almost completely ignored nowadays. A while
> back, I posted about this as well. Now that you've brought it up, I'll
> ask again: Does *anybody* use the 172.16/12 private network? ANYONE?
I don't. If it's big enough to need more than a /24 I usually go straight
to the 10/8 network and be done with it.
> Of course, none of this is really a problem [the users of
> poorly-designed networks are the ones who lose out -- they are, after
> all, *private* networks, so it doesn't affect me in the slightest :)].
> Nonetheless, it disturbs me that I can't find a good *reason* for it.
Part of it might be the people who admin the networks. I know that at
the company I word for the IP address allocation was done by people who
were not familiar with the Internet ( for example, almost all of our
internal hosts are using IP addresses assigned to real machines on the
Internet, and yes we are connected which leads to some interesting
situations ( for painful values of interesting ) ), the new sysadmin
for most of the machines I need to deal with has little Unix and almost
no networking experience and there's serious management pressure to
_not_ go to the "unneccesary" effort and expense of renumbering over to
a real 10/8 private network with proper subnets. I don't have to admin
this mess, so I just keep reminding myself "Not My Problem".
--
Collin was right. Never give a virus a missile launcher.
-- Erk, Reality Check #8
------------------------------
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End of Linux-Networking Digest
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