Linux-Networking Digest #946, Volume #11 Tue, 20 Jul 99 01:13:36 EDT
Contents:
pop3 mail size ("Haris Kusumo")
IP Masquerading & FTP ("Dennis Ayala")
Re: Linux dial-in from NEC computer (jimbo borders)
Cable modem Networking ("UCI")
Re: How to get started on programming TCP/IP sockets on linux? ("Jean Tabel")
Re: IP Masquerading & FTP (Andrew)
Re: Detecting my SOHOware NIC ("UCI")
Improving Webserver performance (Mohit Aron)
Re: Administering Linux through Windows (Frank Hahn)
Re: chat script problems (Frank Hahn)
Re: Diald goes up every 4-5 min? (Frank Hahn)
Re: How to permanent add route command to startup sequence? (Frank Hahn)
Can't talk to modem with ppp ("Jim Gamble")
Re: Linux as network gateway (Monte Phillips)
Re: Linux server (Scott Marlowe)
Large files choke Samba Print queue ("steve epstein")
Help! Alcatel ADSL modem locks up? ("Vipin Malik")
----------------------------------------------------------------------------
From: "Haris Kusumo" <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.setup
Subject: pop3 mail size
Date: Tue, 20 Jul 1999 12:09:38 +1000
Hi,
I have setup Redhat ver 4 and ipop3d.
Is there a limited on mail box size that pop3 can handle.
It seems that I am having problem downloading mail from linux mail server if
my mailbox size > 2M.
I am using ms outlook, I also try outlook express but no luck. (I get,
timeout error or server not responding).
Is there any command option that I need to set on inetd.conf for ipop3d to
handle mail box larger than 2M?
I appreciated if you could e-mail me the reply to [EMAIL PROTECTED]
Thanks in advance.
- Haris -
------------------------------
From: "Dennis Ayala" <[EMAIL PROTECTED]>
Subject: IP Masquerading & FTP
Date: Mon, 19 Jul 1999 22:35:37 -0400
I'm having problems with FTP downloads since I setup a RedHat IP
Masquerading workstation. I kinda fixed the problem with the FTP client when
I specified to use passive mode but I cant doenload anything from the web
browser.
Any suggestions on the cause or solution to this problem?
regards,
Dennis Ayala
------------------------------
From: jimbo borders <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.setup,ahn.tech.linux
Subject: Re: Linux dial-in from NEC computer
Date: 19 Jul 1999 21:25:06 -0500
J.F.Wilkus wrote:
> [EMAIL PROTECTED] wrote:
>
> > I'm pretty new to Linux OS, and I'm trying to get dial-up Internet
> > access to work with my computer.
> >
> > I initially had Internet access via my college's in-room connection to
> > the Internet. Now, I've graduated, and I wanted to connect to the Net
> > with my local ISP. I'm using a number of different ISPs -- Compuserve,
> > MSN, and Netzero.
> >
> > I tried to follow the directions in my "Using Linux" book. It referred
> > me to a program called "dip" to do dial-in, but I don't have that
> > program installed.
> >
> > How can I get myself up and running on the Net?
> >
> > Lewis
> >
> > Sent via Deja.com http://www.deja.com/
> > Share what you know. Learn what you don't.
>
> The easiest way to do it is to go to freshmeat.net and search for
> "wvdial". Its very simple to use and should have you on the net in no
> time.
and don't forget to do the wvdial.conf wvdial.conf thing after you conplile
it. so you
config your dialup.
>
> --
> J.F.Wilkus [tflat] matrix.astrocreep.net
> icq 10933411 SuSE 6.1
> http://astrocreep.net Kernel 2.0.36
------------------------------
From: "UCI" <[EMAIL PROTECTED]>
Subject: Cable modem Networking
Date: Mon, 19 Jul 1999 14:51:31 -0700
Anyone know how to get a cable modem working with LINUX...or at least know
what settings are the most important....
------------------------------
Reply-To: "Jean Tabel" <[EMAIL PROTECTED]>
From: "Jean Tabel" <[EMAIL PROTECTED]>
Subject: Re: How to get started on programming TCP/IP sockets on linux?
Date: Mon, 19 Jul 1999 22:24:10 -0400
Andreas Rennen <[EMAIL PROTECTED]> a �crit dans le message :
[EMAIL PROTECTED]
> Hi to all,
> i am going to finish my study with a diploma. For this reason i have to
> develop
> an Application that controls the throughput of TCP/IP Packets for the
> customers
What do you exactly mean by controlling the throughput of TCP/IP packets ?
if you want to implement
some kind of Quality Of Service or Bandwidth on Demand, you may have a look
on the CBQ library.
(Class Based Queueing),
It does allow you to allocate a minimal amount bandwith according to the
type of protocol you want to
use, and is dropping packets related to other streams if needed.
http://www.aciri.org/floyd/cbq.html
You may have a look on the following commercial site as well for an
introductory text to CBQ:
http://www.xedia.com/products/demystify.htm
Viel gl�ck und bis bald!
Jean Tabel
> of an ISP. I need Information on how to write such a Programm in c on
> Linux.
> Until now i have only a little knowlege about the existing libraries and
>
> the handling
> of TCP/IP sockets. Also i don't know if there are existing produkts for
> Linux or
> Unix. Any help will be appreciated.
>
> Thanks.
>
> Regards
> Andreas Rennen
>
> ADA Das Systemhaus GmbH
> Berliner Platz 12
> 41061 M�nchengladbach
> [EMAIL PROTECTED]
>
> Private:
> [EMAIL PROTECTED]
>
>
>
------------------------------
From: Andrew <[EMAIL PROTECTED]>
Subject: Re: IP Masquerading & FTP
Date: Mon, 19 Jul 1999 21:26:39 -0500
Dennis,
Are you running the ftp module? If you have a "out of the box" Linux
setup, you simply run modprobe ip-masq-ftp or something like that. I
can't remember the name of the module. Use the list module to find out.
The ftp module corrects some problems when FTP downloads (And lists) use
the PORT command. Without it, you get intermittent goofiness when doing
FTP downloads. Sounds like this is your problem...
There are separate modules for running lots of stuff (icq, quake,
cuseeme,etc).
Andrew
On Mon, 19 Jul 1999, Dennis Ayala wrote:
> I'm having problems with FTP downloads since I setup a RedHat IP
> Masquerading workstation. I kinda fixed the problem with the FTP client when
> I specified to use passive mode but I cant doenload anything from the web
> browser.
>
> Any suggestions on the cause or solution to this problem?
>
> regards,
>
> Dennis Ayala
>
>
>
>
------------------------------
From: "UCI" <[EMAIL PROTECTED]>
Subject: Re: Detecting my SOHOware NIC
Date: Mon, 19 Jul 1999 14:36:35 -0700
I was wondering what your lines in /etc/conf.modules look like....
I have two of them...one for my cable modem and one for my network...
When the two cards load...they load on the wrong IRQs and they are called
Macronix....and when i copied tulip.o (the new one) it gave me some errors
with other .o files....anyways just wanted to know how you got yours to work
and which settings are the most vital in yast
------------------------------
From: Mohit Aron <[EMAIL PROTECTED]>
Subject: Improving Webserver performance
Date: 19 Jul 1999 21:49:54 -0500
Hi,
I apologize if you've seen this posting before. I recently wrote a
paper entitled "TCP Implementation Enhancements for Improving Webserver
Performance". The abstract for the paper is attached below. While the paper
studies BSD TCP implementation, some of the proposals might also be relevant
to Linux. The paper can be downloaded from either of the following sites:
http://cs-tr.cs.rice.edu/Dienst/UI/2.0/Describe/ncstrl.rice_cs/TR99-335/
or
http://www.cs.rice.edu/~aron/papers/rice-TR99-335.ps.gz
- Mohit
Abstract:
This paper studies the performance of BSD-based TCP implementations in Web
servers. We find that lack of scalability with respect to high TCP connection
rates reduces the throughput of Web servers by up to 25% and imposes a memory
overhead of up to 32 MB on the kernel. We also find that insufficient accuracy
in TCP's timers results in overly conservative delays for retransmission
timeouts, causing poor response time, low network utilization and throughput
loss. The paper proposes enhancements to the TCP implementation that eliminate
these problems, without requiring changes to the protocol or the API. We also
find that conventional benchmark environments do not fully expose certain
significant performance aspects of TCP implementations and propose techniques
that allow these benchmarks to more accurately predict the performance of real
servers.
------------------------------
From: [EMAIL PROTECTED] (Frank Hahn)
Subject: Re: Administering Linux through Windows
Date: Tue, 20 Jul 1999 03:22:36 GMT
Reply-To: [EMAIL PROTECTED]
On Mon, 19 Jul 1999 08:49:52 +0200, Tom Pennings <[EMAIL PROTECTED]>
wrote:
>I have a Red Hat Linux Server running in the basement. The problem is that I
>want to log on to my server through the TCP/IP netwerk with a
>Windows95/98/NT machine, so I don't have to run to the basement every time I
>need to change some settings. I already tried to do that through Telnet, but
>you may not logon as root through telnet. Can anybody tell me wich program I
>need to install on my Windows95/98/NT machine to emulate a terminal that
>supports X-Windows and logging on as root through TCP/IP?
>
After you telnet in as a normal user, all you have to do is use the
"su" command to do the things you want. Not being able to telnet in
as root is a security feature. I know that can be disabled but I'm
not sure how.
You can also install an X server (I believe that is the correct
terminology) on the Windows side. The one I use is from Starnet
(http://www.starnet.com). Unless you purchase the package, it
only works for two hours at a time. There are also other similiar
programs.
I run Linux on a 486 that does not have a monitor. I just telnet
in from either the Windows 95 machine or a Sun machine.
--
Frank Hahn
If you can read this, you're too close.
------------------------------
From: [EMAIL PROTECTED] (Frank Hahn)
Subject: Re: chat script problems
Date: Tue, 20 Jul 1999 03:22:38 GMT
Reply-To: [EMAIL PROTECTED]
On Mon, 19 Jul 1999 02:53:45 +0100, Dean <[EMAIL PROTECTED]> wrote:
>I can connect to my ISP using minicom, I can even conect using network setup
>from red-hat's control panes, but I can't get chat to even talk to the
>modem. Looking in /var/log/messages the modem never responds to anything.
>I've tried something simple like
>
[Snipped]
The pppd software can be found here:
ftp://cs.anu.edu.au/pub/software/pub/
There are many chat examples given in the included documentation. This
would be the best place to start. A search of http://www.deja.com for
chat scripts will most likely give you something to try. There are
probably one or two chat scripts included in your Linux distribution.
--
Frank Hahn
Pedaeration, n.:
The perfect body heat achieved by having one leg under the
sheet and one hanging off the edge of the bed.
-- Rich Hall, "Sniglets"
------------------------------
From: [EMAIL PROTECTED] (Frank Hahn)
Subject: Re: Diald goes up every 4-5 min?
Date: Tue, 20 Jul 1999 03:22:41 GMT
Reply-To: [EMAIL PROTECTED]
On Sun, 18 Jul 1999 19:20:30 GMT, rbinning <[EMAIL PROTECTED]> wrote:
>I have a small home LAN consisting of 1 Linux box (router/print
>server/firewall)
>1 win95 client, and 1Linux terminal used for web and e-mail access.
>Everything works fine except Diald. It is almost to efficient! It seems
>that my windows box pings every 4-5 minutes looking for
>conformation(whats my name and where is my lunch kit!) I use my ISP DNS
>because that is the only way I could get everything to work. According
>to "tcpdump" when win95 calls, the router (Linux) directs diald to make
>the connection. Information is exchanged and win 95 goes home happy? I
>am new to networking so if I over looked the obvious please bear with
>me...
>
There are a couple of things to try.
One, you can make a hosts file on your MS Windows machine. It is
the same format as the one on your Linux machine. It goes in your
c:\windows directory. Place the names of all your machines in it.
Two, do you have any other network protocols installed on the Windows
machine? I only have TCP/IP installed on my Windows 95 machine.
I don't think you really need anything else.
Three, if none of the above help, search http://www.deja.com. I
have seen others post diald filters to help stop Windows inquires.
I have never bothered with them because I don't seem to have this
problem.
Four, I have seen others mention using tcpdump as a means to find
out what is bringing the link up. Make sure it is the Windows machine
and not something else on one of the other machines. Do you have any
software checking for email or something like that every five
minutes or so?
--
Frank Hahn
Lost interest? It's so bad I've lost apathy.
------------------------------
From: [EMAIL PROTECTED] (Frank Hahn)
Crossposted-To: comp.os.linux.setup
Subject: Re: How to permanent add route command to startup sequence?
Date: Tue, 20 Jul 1999 03:22:44 GMT
Reply-To: [EMAIL PROTECTED]
On 19 Jul 1999 00:22:06 GMT, John H. Chauvin <[EMAIL PROTECTED]> wrote:
[snipped]
>I am not sure what I am doing. My current "network" contains
>just my PC and the HP 4000N connected via ethernet using a
>Asante Hub. I have configured PPP to connect to my ISP so
>that I can access the web and telnet out but have no plans
>to provide incoming access for any service. I am not even
>sure I need an IP address for my PC.
>
>I have been struggling to determine the correct way to configure
>my ethernet. Do I use the IP address of my PC or printer?
>
If you just have your Linux machine and a print server, then
just do something like this:
================================================
/etc/hosts
127.0.0.1 localhost loghost
192.168.100.10 linuxmachinename.domainname linuxmachinename
192.168.100.11 printserver
================================================
I believe you then need to startup the loopback device and the
dummy device to fake a networked system.
On Slackware, an abreviated /etc/rc.d/rc.inet1 file (where my
networking stuff is started) would look like this:
================================================
#! /bin/sh
#
# rc.inet1 This shell script boots up the base INET system.
#
# Version: @(#)/etc/rc.d/rc.inet1 1.01 05/27/93
#
HOSTNAME=`cat /etc/HOSTNAME`
# Attach the loopback device.
/sbin/ifconfig lo 127.0.0.1
/sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo
# Attach the dummy device.
/sbin/ifconfig dummy homer.muscanet.com
/sbin/route add -host homer.muscanet.com
==================================================
You may have to rebuild your kernel with the dummy device enabled.
There is a document and book (published by O-Reilly I believe)
called Network Administrators Guide that would be very helpful
to you.
--
Frank Hahn
"Microwave oven? Whaddya mean, it's a microwave oven? I've been
watching Channel 4 on the thing for two weeks."
------------------------------
From: "Jim Gamble" <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.setup,linux.redhat.misc
Subject: Can't talk to modem with ppp
Date: 20 Jul 1999 04:21:42 GMT
This will sound very strange ....
I am trying to configure PPP on a RedHat 5.1 (kernel 2.0.35) system. The
system previously ran RedHat 4.1 and all hardware worked fine for pppd.
The pppd daemon fails with a connect script failure. Using the "-v" option
of chat shows that no response ever comes back from the modem (i.e., never
see "OK" in response to "ATZ"-- timeout is at default 45 seconds).
However, if I do
"echo ATDT5551212 > /dev/modem",
the modem dials out and attempts to connect (although it seems to take an
awfully long time to do so).
I am using ttyS3 for the modem, and have nothing competing for resources on
ttyS1. The /dev/modem is a hard link to /dev/ttyS3.
I am at the point of looking through the chat.c code, and feeling somewhat
daunted. If anyone has a suggestion, please send it my way.
Thanks in advance,
Jim
------------------------------
From: [EMAIL PROTECTED] (Monte Phillips)
Subject: Re: Linux as network gateway
Date: Tue, 20 Jul 1999 03:22:04 GMT
No prob at all. Check out the IPchains HOWTO
Chip Buck <[EMAIL PROTECTED]> wrote:
>I am running Linux connected with a cable modem internet connection.
>I want to use this machine as a gateway for two winblows machines(95/98)
>Networking between the machines works fine ( samba etc...)
>Does anyone know how best to configure this arrangement ?
>The linux machine has two ethernet cards, one is dedicated to the
>internal network
>the other to the cable modem.
------------------------------
From: Scott Marlowe <[EMAIL PROTECTED]>
Subject: Re: Linux server
Date: Mon, 19 Jul 1999 21:53:09 -0600
[EMAIL PROTECTED] wrote:
> Hi, all! I'm new to Linux OS. Could anyone give me a hand providing
> some guidance and relevant references?
Take a look at the guides here:
http://metalab.unc.edu/mdw/linux.html
------------------------------
From: "steve epstein" <[EMAIL PROTECTED]>
Subject: Large files choke Samba Print queue
Date: Mon, 19 Jul 1999 23:43:31 -0500
I have RH5.1, attached is smb.conf, and it has 3 print queues setup. All
work fine on small files, but large files >20MB choke the queues (these are
graphic laden Pagemaker files). Workstations are all Win98. When the queues
choke, the first indication is the status in the Win98 spool dialogue goes
blank. The hard disk on the server seems to thrash for quite a while, but
settles down after about a half an hour.
The server is an old Intergraph TD-1 with 32MB RAM and about 200MB free on
the HD. Any ideas? Is there a time out that can be reset? Would extra RAM
help? I'd hate to go back to NetWare, but it had no problem with these jobs.
steve epstein
[EMAIL PROTECTED]
begin 666 smb.conf
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`
end
------------------------------
From: "Vipin Malik" <[EMAIL PROTECTED]>
Subject: Help! Alcatel ADSL modem locks up?
Date: Mon, 19 Jul 1999 22:22:46 -0500
I have ADSL at home with SWBell, and they have provided me with an Alcatel
1000 ADSL external modem.
I'm running it, connected to a 10base-T ethernet card in a 486 Linux 2.2.5
computer, which serves as an IP masquerading server for my home LAN.
There is another ethernet card that is connected to a hub on which all my
other computers reside.
The computers on my side has 172.16.17.x addresses and the card connected to
the ADSL modem gets it's IP address via DHCP.
Most of the time stuff works fine :), However (ther's always a however :( )
Now the problem that I am having is this: Every so often, I cannot get
packets out to the internet, even though DHCP has not timed out and my ISP
connection light is still green.
details: ifconfig still shows both network cards working ok, with the
card connected to the ADSL modem still having the IP address.
However I cannot even ping to the router on the otherside of the ADSL modem.
All lights are green and I can see the ADSL TX/RX light
flash as I try to ping outside.
This problem is pretty sporadic, and usually occures only when I have
packets going through (i.e. never found the system in said state even after
prolonged idle times (>1 day), and also happened to me thrice in 1 hour ).
The only solution (i have found) is to power cycle the modem and request
another DHCP IP address (ifdown eth1, then ifup eth1). Incindently just
requesting another IP address via DHCP does not help without the modem power
cycle.
Any ideas?
P.S. I was using the same setup with a modem as the internet connection
point (via ppp) things were just honky dory (i.e. fine :)
Other details: Internal ethernet card=3COM 3C5xx, ADSL ethernet
card=Kingston tech, NE2000 compatable, both ISA.
thanks,
Vipin
------------------------------
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