Linux-Networking Digest #371, Volume #10 Wed, 3 Mar 99 22:13:42 EST
Contents:
Re: cannot sendmail with suse 6.0 (Frank Luedke)
DSL & Linux (Todd Siegel)
ifconfig eth0:1 problem ([EMAIL PROTECTED])
Re: Can I have a shared modem in Lunux (Brad Kittredge)
Re: IP forwarding with port mapping (Rick Onanian)
Re: Machine name themes - what do you use? (Roger Marquis)
Re: Connecting WYSE terminals, How? ([EMAIL PROTECTED])
Network Monitoring Script (Brian Ferris)
Re: SQUID (Tim Kelley)
counting trafic ("Mihai Petre")
Benchmarking FTP -> inetd: connection refused ("Bruce W. Mohler")
Re: Linux routing problem (Georg Kreyerhoff)
SendMail (Lorenzo morbidelli)
----------------------------------------------------------------------------
Crossposted-To: comp.mail.sendmail
From: [EMAIL PROTECTED] (Frank Luedke)
Subject: Re: cannot sendmail with suse 6.0
Date: Wed, 3 Mar 1999 16:59:52 GMT
[EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>HReceived: (from martin@localhost)
> by beaureve.okay.net (8.8.8/8.8.8) id VAA02146;
> Mon, 1 Mar 1999 21:15:14 +0100
>H?x?Full-Name: Martin Drautzburg
>HFrom: Martin Drautzburg <[EMAIL PROTECTED]>
>HMIME-Version: 1.0
>HContent-Type: text/plain; charset=us-ascii
>HContent-Transfer-Encoding: 7bit
>HDate: Mon, 1 Mar 1999 21:15:14 +0100 (MET)
>HTo: [EMAIL PROTECTED]
Keep in mind that the "To:"-Header does not matter where the email
is delivered to. In fact, you can leave the "To:"-Header blank and
the email will still reach the correct destination if the
"Received:"-Line is correct. And the adress is missing in there.
A typically email-header should look like this;
-Received: from <any-system-name> with smtp
by <any-other-system-name> with smtp
for <adress-of-the-destination>; Mon, 1 Jan 1999 01:00:00 + 0000
-Message-ID: <some-id>
Here you will find all the stuff which is needed to transport the
email to the correct adress. Your sendmail does not add the
"Received: from [...] by [...] for [???]" correctly to your header.
You should better create a new sendmail.cf to get it work - or you should
better get the DLD 6.0 or the new Debian 2.1 (will be released
May 9th 1999), 'cause the SuSE 6.0 has got *lots* of bugs ...
I'm using the DLD at home and the Debian at work and no problems occured
at both distributions ...
CU
--
Every generation has a legend ... Star Wars_________
Every journey has a first step ... E P I S O D E I
Every saga has a beginning ... ------------------
The saga begins SPRING 1999 The Phantom Menace
------------------------------
From: Todd Siegel <[EMAIL PROTECTED]>
Subject: DSL & Linux
Date: Wed, 03 Mar 1999 20:46:53 -0500
Can DSL service be used with Linux? If so, what hardware/drivers and
software is needed?
Thanks.
Todd.
[EMAIL PROTECTED]
------------------------------
From: [EMAIL PROTECTED]
Subject: ifconfig eth0:1 problem
Date: Thu, 04 Mar 1999 02:03:01 GMT
Dear all,
I have to problem to setup the second interface on the same NIC, I try the
following command to add the second interface but I can't even do a ping that
IP address.
ifconfig eth0:1 inet 192.168.3.12 broadcase 192.168.3.255 netmask
255.255.255.0
thanks in advance
Ivan
============= Posted via Deja News, The Discussion Network ============
http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
------------------------------
From: Brad Kittredge <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.misc
Subject: Re: Can I have a shared modem in Lunux
Date: Wed, 3 Mar 1999 17:24:01 -0800
You sound like a perfect candidate for IP Masquerading. Check your
documentation. You might have to recompile your kernel, but there is
plenty of information around to help you. I'm using it, and it works
fine.
On Wed, 3 Mar 1999, Aaron Dershem wrote:
> Can I set up a home network and put the modem in the Linux server, but have
> a Win98 machine use the modem on a dial-on-demand system? I'd like to call
> my ISP using Win98, but have the modem on the Linux server. Does that make
> sense? I'm using RH 5.2, if that helps any.
>
> Thanks,
>
> Aaron Dershem.
>
>
>
>
------------------------------
From: Rick Onanian <[EMAIL PROTECTED]>
Subject: Re: IP forwarding with port mapping
Date: Wed, 03 Mar 1999 09:45:18 -0500
Hans wrote:
> Here's what I did to test (I'm on the 192.168.0.1 computer):
> ipportfw -C
> lynx http://192.168.0.1:80 (work's fine)
> ipportfw -A -t 192.168.0.1/8080 -R 192.168.0.1/80
That rule looks like an endless loop; and it doesn't use an outside
address. You're saying that any incoming connection to 192.168.0.1:8080
is to be forwarded to 192.168.0.1:80 (basically, anything coming in to
port 8080 on that machine is to be forwarded to port 80).
> lynx http://192.168.0.1:8080 (seems to hang).
> From the outside, http://195.96.x.y:80 (I have a statisch IP address) works too,
> but http://195.96.x.y:8080 results in an "can not connect".
> Thanks for your time.
Check my other messages in this thread for more info. :)
--
rick - a guy in search of raw (ISO) cd images of SuSE and Slackware
===============
My opinions don't exist, and as such, are not anyone elses. I do not
represent anyone, not even myself, and especially not my employer.
---
Looking for a 1968 Camaro SS convertible, black interior,
beat-up rustbucket that is in need lots of restoration and TLC.
---
Reply to me at either thc <at sign here> psynet <dot> net or
rick <at sign> mail <dot> artmold <dot> com
------------------------------
From: Roger Marquis <[EMAIL PROTECTED]>
Crossposted-To:
vmsnet.networks.misc,microsoft.public.windowsnt.domain,comp.unix.solaris,comp.os.os2.networking.server,comp.os.ms-windows.nt.admin.networking,comp.infosystems.www.servers.unix,comp.protocols.tcp-ip.domains
Subject: Re: Machine name themes - what do you use?
Date: 3 Mar 1999 16:26:35 GMT
In comp.unix.solaris J.D. Baldwin <[EMAIL PROTECTED]> wrote:
>In article <[EMAIL PROTECTED]>, Stephen Carville
>> When machines can change hands several times in their lifetime, it
>> doesn't make sense to let everyone have their own "vanity" names.
Even in that sort of environment you might be able to accomodate
user preferences by assigning host aliases. Aliases are a good
idea in general, especially for distributed resources like NFS
servers, print servers, license servers, etc.
>Humans, however, have a hell of a time remembering the "bland" ones,
>but very quickly adapt to the "cute" ones.
Bland doesn't necessarily mean difficult to remember, sometime the
opposite. Banking, insurance and other heavily audited environments
often use descriptive but generic hostsmes like devel01, devel02,
devsrv01, dbsrv01, etc.
My personal preference is for hostnames with local significance.
Few users have aversions to things like natural history, places,
etc. Some areas are particularly rich in historical nomenclature
(within 8 character limits):
acorn, alba, oak, amador, anza, balboa, bodie, briones, butte, cabrillo,
colusa, donner, elcap, eureka, halfdome, humbolt, inyo, lassen, madera,
menlo, merced, mesa, miwok, modoc, mojave, muir, paiute, pajaro, palo,
pardee, plumas, pomo, portola, redwood, sequoia, serra, sierra, sonora,
sutter, tahoe, tehama, tenaya, trancos, tulare, tule, tunitas, wawona,
yolo, yosemite, yuba
--
Roger Marquis
Roble Systems Consulting
http://www.roble.com/
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: Connecting WYSE terminals, How?
Date: Thu, 04 Mar 1999 00:18:04 GMT
I think you can get a 4 or 8 port Digiboard adapter that plugs into
your ISA slot on theLinux box which would allow you to connect 4 or 8
terminals to it - not sure though. Perhaps someone out there can shed
more light on this. I do know that somewhere in one of the HOWTO's
the digiboard is mentioned but I do not know which HOWTO - I will
check some of my hardcopies to see if I still have that - otherwise
maybe someone else reading this knows what I am talking about and can
clue you in a little better.
Jeff
[EMAIL PROTECTED]
On Wed, 03 Mar 1999 21:27:57 GMT, [EMAIL PROTECTED] (Master Luke)
wrote:
>I recently accquired some WYSE terminals from a company throwing them out.
>Does anyone know how and if it is possible to use linux to activate the
>terminals and use them off of one linux box? Unfortunately the only docs with
>it were MS-dos and they were no help at all with what I want to do.
>
>Any help or pointers to help would be appreciated.
>
>Thanks
>
>[EMAIL PROTECTED]
>
------------------------------
From: Brian Ferris <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.misc
Subject: Network Monitoring Script
Date: Thu, 04 Mar 1999 02:37:00 GMT
==============CDC5F6FE2851F9A0AE62C279
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
I am using a RedHat 5.2 server to masquerade an 80+ user office to
provide Internet access. A major sticking point with my boss is that
the machine must be able to log Internet usage among employees.
I have tackled this problem from a number of angles and I finally
decided that I would write a shell script to handle the job (I mainly
chose this because I wanted to learn shell programming). The script is
a follows (it is run out of my home directory <bferris> right now so
files are based there)...
#!/bin/sh
# This script monitors Internet usage by monitoring the
/proc/net/ip_masquerade file. This file
# stores info in the following format...
# type (TCP,UDP,etc.) source_ip:port dest_ip:port masq_port
# Ip addresses are in hex format. Linux uses this file to keep track of
which ports it masqued
#addresses to.
tcp_only="TCP"
# I use a temporary file <addition> to store the results of the script.
The first thing added to this
# file is the date.
echo $(date) > /home/bferris/addition
#I use a read to pull the type, source_ip, and dest_ip from
/proc/net/ip_masquerade
while read type source dest rest; do
# I check to see if the type is TCP since I only want this type
if [ $type = $tcp_only ]; then
# I wrote a quick and dirty cpp prog to convert the hex
IP address into the regular x.x.x.x format
source=$(/usr/local/bin/hextodec $source)
dest=$(/usr/local/bin/hextodec $dest)
# To avoid having to make a nslookup call for every IP,
I created a list of addresses and
# their host names in the host_list file. If the
address hasn't been added to the list yet...
if dest_name=$(grep $dest /home/bferris/host_list) ;
then
adder="$source $dest_name"
else
# ... I make a nslookup to find the server name.
dest_name=$(nslookup $dest | grep Na | cut -c
7-)
# If the lookup doesn't come up with anything,
the name becomes unknown
if [ -z $dest_name ]; then
dest_name="Unknown"
fi
adder="$source $dest $dest_name"
# Since this server wasn't in the host_list
file, I add it
echo $dest $dest_name >> host_list
fi
# I check to see if I have added the $adder to the
addition file yet. I do this because
# a website can be masq as many as ten times to the same
IP in a normal ip_masquerade
# listing. There is no point in adding it ten times so
I just add it once.
if ! grep -q "$adder" /home/bferris/addition ; then
echo $adder >> /home/bferris/addition
fi
fi
done < /proc/net/ip_masquerade
# When I'm all done, I have a time stamped file that lists who's been
using the net. This file
# can be appended to the final log file which I will then let my boss
look at so he can deal out
# sweet justice.
more /home/bferris/addition
<EOF>
First, let me say that all I know about shell scripting came from
this project. This script works but I have a feeling that there might
be a better, more efficient way of getting the same results. This
script would currently have to be run by cron every once in a while to
properly log. With that in mind, I will now ask all my questions
-Is this script the answer or am I barking up the wrong tree?
-Should I do something with CPP that would run 100x faster?
-Should I just bite the bullet and install a proxy like squid which
does logging too?
-Should I do something crazy like install my own local DNS server
and do logging here (I want to set up a DNS for fun anway...)?
I know that is a lot of questions so any thoughts the world has on
the subject is much appreciated. Besides, the whole thing can
definitely be chocked up as a learning experience if nothing comes of
it.
Thanks,
Brian Ferris
==============CDC5F6FE2851F9A0AE62C279
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
<HTML>
I am using a RedHat 5.2 server to masquerade an 80+
user office to provide Internet access. A major sticking point with
my boss is that the machine must be able to log Internet usage among employees.
<BR> I have tackled this problem from a number of angles
and I finally decided that I would write a shell script to handle the job
(I mainly chose this because I wanted to learn shell programming).
The script is a follows (it is run out of my home directory <bferris>
right now so files are based there)...
<P><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666">#!/bin/sh</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># This script monitors
Internet usage by monitoring the /proc/net/ip_masquerade file. This
file</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># stores info in
the following format...</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># type
(TCP,UDP,etc.)
source_ip:port dest_ip:port masq_port</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># Ip addresses are
in hex format. Linux uses this file to keep track of which ports
it masqued</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666">#addresses
to.</FONT></FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">tcp_only="TCP"</FONT><FONT
FACE="Arial,Helvetica"><FONT COLOR="#FF6666"></FONT></FONT>
<P><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># I use a temporary
file <addition> to store the results of the script. The first
thing added to this</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># file is the
date.</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica">echo $(date) > /home/bferris/addition</FONT><FONT
FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666">#I use a read to
pull the type, source_ip, and dest_ip from /proc/net/ip_masquerade</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica">while read type source dest rest; do</FONT><FONT
FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">
<FONT COLOR="#FF6666"># I check to see if the type is TCP since I only
want this type</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica">
if [ $type = $tcp_only ]; then</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT
FACE="Arial,Helvetica">
<FONT COLOR="#FF6666"># I wrote a quick and dirty cpp prog to convert the
hex IP address into the regular x.x.x.x format</FONT></FONT>
<BR><FONT
FACE="Arial,Helvetica">
source=$(/usr/local/bin/hextodec $source)</FONT>
<BR><FONT
FACE="Arial,Helvetica">
dest=$(/usr/local/bin/hextodec $dest)</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT
FACE="Arial,Helvetica">
<FONT COLOR="#FF6666"># To avoid having to make a nslookup call for every
IP, I created a list of addresses and</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT
COLOR="#FF6666">
# their host names in the host_list file. If the address hasn't been
added to the list yet...</FONT></FONT>
<BR><FONT
FACE="Arial,Helvetica">
if dest_name=$(grep $dest /home/bferris/host_list) ; then</FONT>
<BR><FONT
FACE="Arial,Helvetica">
adder="$source $dest_name"</FONT>
<BR><FONT
FACE="Arial,Helvetica">
else</FONT>
<BR><FONT
FACE="Arial,Helvetica"> <FONT
COLOR="#FF6666">
# ... I make a nslookup to find the server name.</FONT></FONT>
<BR><FONT
FACE="Arial,Helvetica">
dest_name=$(nslookup $dest | grep Na | cut -c 7-)</FONT>
<BR><FONT
FACE="Arial,Helvetica">
<FONT COLOR="#FF6666"># If the lookup doesn't come up with anything, the
name becomes unknown</FONT></FONT>
<BR><FONT
FACE="Arial,Helvetica">
if [ -z $dest_name ]; then</FONT>
<BR><FONT
FACE="Arial,Helvetica">
dest_name="Unknown"</FONT>
<BR><FONT
FACE="Arial,Helvetica">
fi</FONT>
<BR><FONT
FACE="Arial,Helvetica">
adder="$source $dest $dest_name"</FONT>
<BR><FONT FACE="Arial,Helvetica"> </FONT>
<BR><FONT
FACE="Arial,Helvetica">
<FONT COLOR="#FF6666"># Since this server wasn't in the host_list file,
I add it</FONT></FONT>
<BR><FONT
FACE="Arial,Helvetica">
echo $dest $dest_name >> host_list</FONT>
<BR><FONT
FACE="Arial,Helvetica">
fi</FONT>
<BR><FONT FACE="Arial,Helvetica"> </FONT>
<BR><FONT
FACE="Arial,Helvetica">
<FONT COLOR="#FF6666"># I check to see if I have added the $adder to the
addition file yet. I do this because</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT
COLOR="#FF6666">
# a website can be masq as many as ten times to the same IP in a normal
ip_masquerade</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT
COLOR="#FF6666">
# listing. There is no point in adding it ten times so I just add
it once.</FONT></FONT>
<BR><FONT
FACE="Arial,Helvetica">
if ! grep -q "$adder" /home/bferris/addition ; then</FONT>
<BR><FONT
FACE="Arial,Helvetica">
echo $adder >> /home/bferris/addition</FONT>
<BR><FONT
FACE="Arial,Helvetica">
fi</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">
fi</FONT>
<BR><FONT FACE="Arial,Helvetica">done < /proc/net/ip_masquerade</FONT><FONT
FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># When I'm all done,
I have a time stamped file that lists who's been using the net. This
file</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># can be appended
to the final log file which I will then let my boss look at so he can deal
out</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica"><FONT COLOR="#FF6666"># sweet justice.</FONT></FONT>
<BR><FONT FACE="Arial,Helvetica">more /home/bferris/addition</FONT><FONT
FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica"><EOF></FONT>
<P> First, let me say that all I know about shell scripting
came from this project. This script works but I have a feeling that
there might be a better, more efficient way of getting the same results.
This script would currently have to be run by cron every once in a while
to properly log. With that in mind, I will now ask all my questions
<BR> -Is this script the answer or am I barking up the
wrong tree?
<BR> -Should I do something with CPP that would run 100x
faster?
<BR> -Should I just bite the bullet and install a proxy
like squid which does logging too?
<BR> -Should I do something crazy like install my own
local DNS server and do logging here (I want to set up a DNS for fun anway...)?
<BR>
<BR> I know that is a lot of questions so any thoughts
the world has on the subject is much appreciated. Besides, the whole
thing can definitely be chocked up as a learning experience if nothing
comes of it.
<P>Thanks,
<BR>Brian Ferris
<BR>
<BR>
<BR>
<BR> </HTML>
==============CDC5F6FE2851F9A0AE62C279==
------------------------------
From: Tim Kelley <[EMAIL PROTECTED]>
Subject: Re: SQUID
Date: Wed, 03 Mar 1999 06:41:21 -0600
Reply-To: [EMAIL PROTECTED]
Philip Hunt wrote:
>
> Got Squid running ... anyone know howto get stats on requests made to
> the proxy ?? -- I know about the log files, but isn't there some kind of
> html reporting available ?
>
> Cheers,
> Phil.
Take a look at the squid page - http://squid.nlanr.net/Squid/Scripts
lots of stuff there.
--
Tim Kelley
[EMAIL PROTECTED]
New Orleans, LA
------------------------------
From: "Mihai Petre" <[EMAIL PROTECTED]>
Subject: counting trafic
Date: 3 Mar 1999 14:56:36 GMT
I would like to have the amount of trafic going on that card (not only from
web server) as a total value (maybe as a gif).
any ideea ?
Thanx
Mihai
------------------------------
From: "Bruce W. Mohler" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Subject: Benchmarking FTP -> inetd: connection refused
Date: Wed, 03 Mar 1999 14:55:10 GMT
I'm running a Perl script (that I wrote) to benchmark a Compaq
server comparing the performance between Linux and Windows NT.
I'm currently running RedHat Linux 5.2 and wu-ftpd version
2.4.2b18-2.1 on the server. The source code version of inetd
is 1.13 loaded as part of netkit-base-1.10-13. Once I'm done
benchmarking Linux, one of the NT admins will load Win NT 4.0
Server on the box and I'll do the same thing again.
I'm running my test on an HP E35 server (low end). My script will
run 'n' processes, each one randomly reading/writing files from/to
the Compaq FTP server. When I'm running 4 processes from the HP
test box (and sometimes with fewer processes) several times during
the test, all connections will start to be refused. If I restart
inetd ("/etc/rc.d/init.d/inet restart"), then the condition clears.
This is why I'm looking at inetd rather than wu-ftpd.
There are no messages in the syslog (/var/log/messages) that suggests
any problems. I'm not sure what to look at in the ps or netstat output
to point me to the cause of the behavior.
Can anyone suggest some things to look at in the configuration to help
explain what is happening? I'd really like to eliminate this behavior
as well. I'm trying to demonstrate the Linux will be more robust than
Windows NT.
Bruce
--
Bruce W. Mohler 619-458-2675 (voice)
SAIC/ITS/Server Support 619-535-7806 (fax)
Sr UNIX system administrator 888-781-5697 (pager)
mailto: [EMAIL PROTECTED]
------------------------------
From: Georg Kreyerhoff <[EMAIL PROTECTED]>
Crossposted-To: comp.security.firewalls
Subject: Re: Linux routing problem
Date: 03 Mar 1999 14:58:44 +0100
[EMAIL PROTECTED] (Francisco Calonge) writes:
>
> Hi,
>
> Our network has several subclass B of an autonomous class B system
>
> We are trying to set up a firewall with LRP ( Linux Router Project ).
>
> As you can see in the diagram below, the fw has to see the network
> X.Y.0.0 through O port and subnetwork X.Y.w.0 through I port. But using class B
> mask, PC1 is not able to reach even the fw port O. It obviously can, using
> class C mask, but our intranet PCs use class B masks.
>
If you use class-B masks, then the IP-Numbers of the other net must
be different one of the first two bytes.
> Our Cisco router can properly handle with this situation but we don't
> know how it is implemented.
Hm???
I'm not sure if this a proper handling. IP-Numbers X.Y.anything
with netmask 255.255.0.0 are all expected to be in one subnet and
not to be routed. Either change the IP-numbers in the net with PC2
or the netmasks in the net with PC1.
Georg
------------------------------
From: Lorenzo morbidelli <[EMAIL PROTECTED]>
Subject: SendMail
Date: Wed, 03 Mar 1999 16:09:12 +0100
Hello,
someone know what file I have to edit to allow me to read mail form an
external server?
I have my PC Linux attached to an internet connection, where on a sun
Workstation I receive mail.
I would like when I type "mail" that Linux goes and check on the Sun
server for my mail..
thanks
------------------------------
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End of Linux-Networking Digest
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