Linux-Networking Digest #288, Volume #10 Tue, 23 Feb 99 08:13:31 EST
Contents:
Firewall blocks squid (Kai Stroh)
Re: Diald - IE times out (Kai Stroh)
(probably newbie) Problem with diald that is driving me up the wall (Eric Larson)
qmail and pop3 (Stefan Wolber)
Re: New Message in netscape freezes with 2.2.1 Kernel (matt)
Networkin help (Kenn Owen)
Re: PPP on RedHat 5.2 (Josh T)
Re: detect sniff ("ephidryn hydrochloride")
Re: New Message in netscape freezes with 2.2.1 Kernel
Re: Token Ring locking up ("Michael Knigge")
Re: Token Ring locking up ("Michael Knigge")
Re: Best nic (xcitor)
Re: Linux as a small LAN router ([EMAIL PROTECTED])
Re: New Message in netscape freezes with 2.2.1 Kernel (matt)
diald installation problems ("Mark Peoples")
Re: Desktop Hub VS. Rackmount Hub (Steven Williams)
limited resource: network ("olcay ergun")
pinging through firewall? ("pules")
Virus/Applet checking (Adriaan)
Re: Q: Is it possible to manage multiple domains on 1 ip? (jc)
Urgent...dialup ppp info for RH5.2 please (Bill Dossett)
IP forwarding working in one direction only !? (Hugo Haas)
----------------------------------------------------------------------------
From: Kai Stroh <[EMAIL PROTECTED]>
Subject: Firewall blocks squid
Date: Tue, 23 Feb 1999 11:04:03 +0100
Hi folks,
I use a Linux machine as a router to the internet and I configured my
firewall to block everything except the ports TCP 80 (WWW), TCP & UDP
110 (POP3) and TCP 25 (SMTP). WWW and Mail work just fine this way.
Recently I installed squid and allowed connections on TCP 3128, but the
clients cannot use the proxy. When I make the firewall accept *any*
packets, squid works the way it should.
iptraf displays that the Clients (i.e. Netscape) try to use the ports
1101, 1102, 1103... and squid does something on 127.0.0.1:1024, :1025,
:1026...
Does anyone know how I have to configure the firewall so won't block the
proxy?
TIA
Kai
------------------------------
From: Kai Stroh <[EMAIL PROTECTED]>
Subject: Re: Diald - IE times out
Date: Tue, 23 Feb 1999 10:56:38 +0100
Fly schrieb:
> 5. The Win98 machine then says it can't connect to network.
> 6. At this point if I do a refresh and my homepage comes up.
The problem is that your ISP uses dynamic IPs. Thus, when you send the
first request, the Linux machine is not yet connected and doesn't know
its own IP, so the routing won't work. When you push refresh, the router
*is* connected and everything works fine.
Look for a file /proc/sys/net/ipv4/ip_dynaddr (it might depend on the
distribution, I use S.u.S.E. 6.0). You can fix the problem by typing
echo 7 > /proc/sys/net/ipv4/ip_dynaddr
Strange way to fix this, I know. But it works. You should put this line
in your boot script because the content of this file is set back to 0
with every reboot.
Hope this helps
Kai
------------------------------
From: Eric Larson <[EMAIL PROTECTED]>
Subject: (probably newbie) Problem with diald that is driving me up the wall
Date: Sun, 21 Feb 1999 21:01:38 -0500
Hi -
I have what is probably a very simple problem with diald - I cannot for
the life of me get it to use the ip-up and ip-dowm script options. After
diald makes a connection, no changes in the ipfw rules
according to the firewall.up script are noted. I can run the firewall.up
script manually without a problem. Does anyone know what I might be
missing?? ???
This is what my diald.conf file looks like:
include /usr/lib/diald/standard.filter
# stuff to set up the diald connection
device /dev/modem
speed 115200
lock
mode ppp
# We may get another terminal server, thus use
# 'dynamic' and do not tell PPP the IP number of the other end
# For use with gated, comment out the 'dynamic' option, and
# set remote to be the same as local
dynamic
local 10.0.0.1
remote 10.0.0.2
pppd-options asyncmap 0
# Delay sending packets for 5 seconds after PPP device opens -
# this allows routes to be established back to the appropriate dialup
server.
defaultroute
modem
crtscts
two-way
up-delay 5
redial-timeout 5
connect /etc/diald/connect
fifo /etc/diald/diald.ctl
ip-up /etc/diald/firewall.up
ip-down /etc/diald/firewall.down
------------------------------
From: Stefan Wolber <[EMAIL PROTECTED]>
Subject: qmail and pop3
Date: Tue, 23 Feb 1999 11:23:03 -0500
Reply-To: [EMAIL PROTECTED]
I installed qmail relatively successful.
Now I try to get qmail to deliver to POP3 accounts. Even that worked. The only
problem right now is that if the mailreader (Netscape) tries to access it gets the
message "this user has no $HOME/Maildir" (but thats not true :-)).
The /var/log/qmail-pop3d directory contains a file that has only lines like the
following:
919676349.079382 tcpserver: pid 3058 num 0 from 194.97.108.99
919676350.243411 tcpserver: ok 3058 :194.97.108.65:110 :194.97.108.99:root:1049
919676350.687573 tcpserver: end 3058 status 256
919676445.438553 tcpserver: pid 3088 num 0 from 194.97.108.99
919676446.387512 tcpserver: ok 3088 :194.97.108.65:110 :194.97.108.99:root:1050
919676446.563775 tcpserver: end 3088 status 256
My /etc/services looks like this:
...
pop2 109/tcp postoffice # POP version 2
pop2 109/udp
pop3 110/tcp # POP version 3
pop3 110/udp
sunrpc 111/tcp
...
and the qmail-pop3d.init that is located in the /etc/rc.d and called by rc2.d looks
like this:
#! /bin/sh
# $INITDIR/qmail-pop3d.init
# INITDIR is defined below
# Sun Dec 14 1997 XZ <[EMAIL PROTECTED]> v2.3
#
# chkconfig: 345 83 48
# description: Start, stop, restart, reload, and otherwise \
# signal qmail-pop3d. \
# Makes heavy use of parts of DJB's daemontools package \
# It also relies upon daemontools.functions for 91.04982% \
# of the grunt work.
#
# Start, stop, restart, reload, and otherwise signal qmail-pop3d
# Makes heavy use of parts of DJB's daemontools and ucspi-tcp packages
# It also relies upon daemontools.functions for 91.04982% of the grunt work.
#
#
# [EMAIL PROTECTED]:
# small fixes and modifications
# customize
QMAILHOME=/var/qmail # ~qmail
USERID=`id -u root` # the UID to run the program with
GROUPID=`id -g root` # the GID to run the program with
HOST=$($QMAILHOME/bin/dnsfq $($QMAILHOME/bin/hostname)) # your hostname
PROG=qmail-pop3d # what program are we playing with?
COMMAND=$PROG # command to start $PROG
DIR=/var/lock/$PROG # a directory for supervise to use
LOGDIR=/var/log/$PROG # directory for logs
LOGUSER=qmaill # user to own the logs
LOGSIZE="-s 1000000" # size of logfile
CDB=/etc/tcprules.d/$PROG.cdb # rules file
CHKPASS="/usr/local/bin/checkpassword" # how to authenticate users
# wb 22.2 von checkpassword auf /usr/local/bin/qmail/checkpassword geaendert.
CONCURRENT=40 # number of concurrent connections
# (40 is the default of tcpserver)
PORT=pop3 # what /etc/services calls "POP3"
# wb 22.2 von pop-3 nach pop3
VERBOSE=-v # use verbose option to tcpserver
INITDIR=/etc/rc.d/init.d # location of initscripts
# Grab the daemontools init functions
. $INITDIR/daemontools.functions
start() {
if check; then
echo "$PROG is already running"
else
echo -n "Starting $PROG..."
if [ -e $CDB ]; then
supervise $DIR \
tcpserver $VERBOSE -c$CONCURRENT -x $CDB -u$USERID -g$GROUPID 0 $POR
T \
qmail-popup $HOST $CHKPASS $COMMAND Maildir \
2>&1 | setuser $LOGUSER accustamp \
| setuser $LOGUSER cyclog $LOGSIZE $LOGDIR &
else
supervise $DIR \
tcpserver $VERBOSE -c$CONCURRENT -u$USERID -g$GROUPID 0 $PORT \
qmail-popup $HOST $CHKPASS $COMMAND Maildir \
2>&1 | setuser $LOGUSER accustamp \
| setuser $LOGUSER cyclog $LOGSIZE $LOGDIR &
fi
echo "done"
fi
and so on ...
Anybody any ideas what happens?
Stefan Wolber
------------------------------
From: matt <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.setup,comp.os.linux.misc,alt.os.linux
Subject: Re: New Message in netscape freezes with 2.2.1 Kernel
Date: Sun, 21 Feb 1999 08:43:37 +0000
Gerd Roethig wrote:
> Hello,
>
> On Sun, 21 Feb 1999 23:48:22 -0700 Doug Nordwall
> <[EMAIL PROTECTED]> wrote:
>
> >Whenever I hit new message in Netscape (4.08 and 4.5), it freezes
> >netscape. This is after I updated my kernel to 2.2.1. It does not freeze
> >if I am logged in as root, but it does as any user, so I suspect that it
> >is a permission problem on a library, but I have no idea which. Perhaps
> >someone with more knowledge could give me a hand?
>
>
Sounds alot like the problem I had. The home directories were NFS mounted
and there seems to be a problem with NFS in 2.2.1 that is fixed in 2.2.2
Matt
------------------------------
From: Kenn Owen <[EMAIL PROTECTED]>
Subject: Networkin help
Date: Tue, 23 Feb 1999 02:19:22 +0000
I know I am missing something, I think I just have been looking at it
too long.
I have an internal network using private IP addressing, 192.168.0.0/24
my Linux box is set up with an eth0 at 192.168.0.254 and a ppp with a
fixed public IP. The internal network is able to see and communicate
with
each other without any problem. My linux box can communcate with both
the
internal network and the internet. None of my internal network boxes
can
communicate with the internet. I have all the internal boxes set with
the gateway
of the linux box and the linux box has a gateway of my upstream isp
gateway.
What am I missing here.
Any help would be appreciated.
------------------------------
Subject: Re: PPP on RedHat 5.2
From: [EMAIL PROTECTED] (Josh T)
Date: 21 Feb 1999 17:31:45 -0600
I had the same problem. You need to make sure your default gateway is set to
your ppp0 ip address. I also found to add "defaultroute" to the pppd command.
Good Luck
In article <7ah6gm$4rv$[EMAIL PROTECTED]>, [EMAIL PROTECTED] says...
>
>Hi;
>I installed RedHat 5.2, but I can not make my ppp connection work. From
>/var/log/messages, I do see the IP add of my PC and the IP add of my ISP. I
>am only able to ping these two IP address, not anyotherss, like
>sunsite.unc.edu, or my DNS server. I have done many ppp connections on
>RedHat 5.0 or 5.1 successfully, and I don't why I can not make it work under
>RedHat 5.2.
>
>Thank very much - Randy
>
>
------------------------------
From: "ephidryn hydrochloride" <[EMAIL PROTECTED]>
Subject: Re: detect sniff
Date: Tue, 23 Feb 1999 02:43:44 -0800
If the sniff program is written correctly, then it
should be undetectable.
On an ethernet, the data is broadcast to all the
machines, you're machine has a MAC address which
it looks for in the ethernet packets. If that
address is not in the ethernet packet, your
machine ignores the packet. Sniffer programs take
control of the ethernet card and place it in a
certain mode where it picks up everything and
passes it to the program. the program then
determines whether or not you want the data. Thats
one of the reasons location is so important to a
succesfull sniff hack.
[EMAIL PROTECTED] wrote in message
<7attge$uam$[EMAIL PROTECTED]>...
>I'm french student and i'm programming with
libpcap
>a application "arpalert" but i would like to know
>if use the sniff is detect by the others ????
>
>
>"L'essentiel est invisible " Saint-ex'
>
>-----------== Posted via Deja News, The
Discussion Network ==----------
>http://www.dejanews.com/ Search, Read,
Discuss, or Start Your Own
------------------------------
From: [EMAIL PROTECTED] ()
Crossposted-To: comp.os.linux.setup,comp.os.linux.misc,alt.os.linux
Subject: Re: New Message in netscape freezes with 2.2.1 Kernel
Date: 23 Feb 1999 11:00:46 GMT
Damn, I can't even get to the Kernel patch for 2.2.2... all the servers
are full!!!
- Mike
On Sun, 21 Feb 1999 08:43:37 +0000, matt <[EMAIL PROTECTED]> wrote:
>Gerd Roethig wrote:
>
>> Hello,
>>
>> On Sun, 21 Feb 1999 23:48:22 -0700 Doug Nordwall
>> <[EMAIL PROTECTED]> wrote:
>>
>> >Whenever I hit new message in Netscape (4.08 and 4.5), it freezes
>> >netscape. This is after I updated my kernel to 2.2.1. It does not freeze
>> >if I am logged in as root, but it does as any user, so I suspect that it
>> >is a permission problem on a library, but I have no idea which. Perhaps
>> >someone with more knowledge could give me a hand?
>>
>>
>
>Sounds alot like the problem I had. The home directories were NFS mounted
>and there seems to be a problem with NFS in 2.2.1 that is fixed in 2.2.2
>
>Matt
>
--
=====================================================================
Michael B. Trausch [EMAIL PROTECTED]
V: (419) 838-8104 F: (815) 846-9374
"Curiosity is the very basis of education and if you tell me that
curiosity killed the cat, I say only the cat died nobly."
- Arnold Edinborough
If you do not have my public PGP key, you are encouraged to obtain it
from my website at http://www.wcnet.org/~mtrausch/mykey.zip. You need
to have PGP 5.0i or newer to use the key.
=====================================================================
------------------------------
From: "Michael Knigge" <[EMAIL PROTECTED]>
Subject: Re: Token Ring locking up
Date: Tue, 23 Feb 1999 11:14:15 +0100
[EMAIL PROTECTED] schrieb in Nachricht
<7asgvk$oml$[EMAIL PROTECTED]>...
>I have some IBM Auto and Turbo TR cards here, and whenever I try and do the
>ifconfig command to start it up, it just hangs forever. I've tried
When I remember right, the Turbo TR Cards are not supported. You should
have a look at the TokenRing HOWTO and the Source code....
bye
Michael
------------------------------
From: "Michael Knigge" <[EMAIL PROTECTED]>
Subject: Re: Token Ring locking up
Date: Tue, 23 Feb 1999 11:14:15 +0100
[EMAIL PROTECTED] schrieb in Nachricht
<7asgvk$oml$[EMAIL PROTECTED]>...
>I have some IBM Auto and Turbo TR cards here, and whenever I try and do the
>ifconfig command to start it up, it just hangs forever. I've tried
When I remember right, the Turbo TR Cards are not supported. You should
have a look at the TokenRing HOWTO and the Source code....
bye
Michael
------------------------------
From: [EMAIL PROTECTED] (xcitor)
Subject: Re: Best nic
Date: Sun, 21 Feb 1999 18:14:37 -0500
Reply-To: [EMAIL PROTECTED]
On Sun, 21 Feb 1999 23:13:22 -0000,
David wrote
from <[EMAIL PROTECTED]>
in message <7aq3gs$o7n$[EMAIL PROTECTED]>:
>I am in need on a new network card 10base2 is fine .
>
>Can somebody reccomend one that redhat 5.2 will install with no problems??
I've always liked the 3Com 3C509 10base2 card. I believe it is quite
well supported under Linux.
--
You will be audited by the Internal Revenue Service.
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: Linux as a small LAN router
Date: Tue, 16 Feb 1999 10:02:40 +0100
OK thanks - I'm not quite into this, but I'll take a look at the
Masquerading HOWTO.
Brian McCauley <[EMAIL PROTECTED]> wrote:
: The Masquerading HOWTO is probably a good start.
: I can't see why you think you may need full-blown NAT, I'd have
: thought plain masquerading should suffice.
--
Anders Gulden Olstad @ Jeeves
RedHat 5.2 Linux kernel 2.0.36
"Penguins are generally nice creatures"
------------------------------
From: matt <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.setup,comp.os.linux.misc,alt.os.linux
Subject: Re: New Message in netscape freezes with 2.2.1 Kernel
Date: Sun, 21 Feb 1999 07:50:50 +0000
Gerd Roethig wrote:
> Hello,
>
> On Sun, 21 Feb 1999 23:48:22 -0700 Doug Nordwall
> <[EMAIL PROTECTED]> wrote:
>
> >Whenever I hit new message in Netscape (4.08 and 4.5), it freezes
> >netscape. This is after I updated my kernel to 2.2.1. It does not freeze
> >if I am logged in as root, but it does as any user, so I suspect that it
> >is a permission problem on a library, but I have no idea which. Perhaps
> >someone with more knowledge could give me a hand?
>
I had the same problem. My home directories are NFS mounted on another
machine. root worked because it had a local home directory. When I set a
user to a local home directory, it worked find.
This NFS bug seems to have been fixed in kernel 2.2.2
Matt
------------------------------
From: "Mark Peoples" <[EMAIL PROTECTED]>
Subject: diald installation problems
Date: Sun, 21 Feb 1999 23:36:26 -0700
Hello,
I finally decided to put my Linux box in its own room (a walk-in closet).
It freed up a lot of space (the desk it was on is now out of the room).
However, whenever my roomate or I want to dialup the Internet, we have to
walk into the closet, and activate the connection...so it's a bit of an
inconvenience.
I downloaded diald, and uncompressed it...however, there was only a file
called diald. I read the mini-HOWTO, but the files weren't there that it
said would be.
Any ideas?
Thanks,
Mark Peoples [EMAIL PROTECTED]
------------------------------
From: Steven Williams <[EMAIL PROTECTED]>
Crossposted-To: comp.dcom.lans.ethernet,comp.os.ms-windows.nt.admin.networking
Subject: Re: Desktop Hub VS. Rackmount Hub
Date: Tue, 23 Feb 1999 22:35:44 +1100
Rackmount Hubs are usually for supporting SNMP with RMON probing
Box wrote:
> What is the difference between the two? Whya re rackmounts more expensive?
------------------------------
From: "olcay ergun" <[EMAIL PROTECTED]>
Crossposted-To:
comp.os.linux.help,comp.os.linux.help.hardware,comp.os.linux.help.misc,comp.os.linux.help.software,comp.os.linux.help.video,comp.os.linux.m68k,comp.os.linux.misc,comp.os.linux.setup,comp.os.linux.software,comp.os.linux.v
Subject: limited resource: network
Date: Tue, 23 Feb 1999 13:29:20 +0200
Hi,
I am going to make a research about Network Resource Management.
We'd like to control applications's network access on Operating System(OS)
level. We consider bandwidth as a limited resource and it must be used
fairly
among computers. In order words, OS watches requests of applications to
network.
If OS has permission to access for a machine, it lets the application to
use network resources. The diffuculty we've currently faced is that I
couldn't find research or resource about this topic. If you hit some
paper about that, please let me know.
Thanks in advance.
Olcay ERGUN
------------------------------
From: "pules" <[EMAIL PROTECTED]>
Subject: pinging through firewall?
Date: Thu, 11 Feb 1999 11:17:35 +0100
Is there a way to let a computer behind a masquerading firewall answer
pings? I'm running a HalfLife server, and to be listed in the server list,
the master server needs to ping it.
------------------------------
From: Adriaan <[EMAIL PROTECTED]>
Crossposted-To: alt.os.linux,comp.os.linux
Subject: Virus/Applet checking
Date: Tue, 23 Feb 1999 13:00:30 +0100
Hi,
We have build a network with a Linux squid web proxy and now I was
wondering if it is possible to secure the network from being infiltrated
by harmful java applets, harmful Active X and viruses. I'm sure this is
somehow possible. Maybe there is a product which runs on a Wintel
machine but is able to cooperate with squid.
All people at the office can reach the internet through this proxy
server. I know McAfee has a product which can do this in cooperation
with MS proxy server.
I'm really having a hard time keeping the Windows NT boys of my systems
so please help.
Adriaan van der Hek
[EMAIL PROTECTED]
------------------------------
From: jc <[EMAIL PROTECTED]>
Subject: Re: Q: Is it possible to manage multiple domains on 1 ip?
Date: Tue, 23 Feb 1999 00:57:18 -0800
Reply-To: [EMAIL PROTECTED]
On Sun, 21 Feb 1999, Chris wrote:
> is it possible to manage multiple email domain on 1 ip i know i can manage
> multiple domains on 1 up using apach for web but how about for email?
>
> Chris
>
>
>
>
------------------------------
From: Bill Dossett <[EMAIL PROTECTED]>
Subject: Urgent...dialup ppp info for RH5.2 please
Date: Tue, 23 Feb 1999 11:53:55 +0000
Reply-To: [EMAIL PROTECTED]
Hi,
sorry for urgent, but I've got a couple of users demanding
their email...
I've just had to load Redhat 5.2 on the machine that
I used for two ppp dialup lines for my company. I used
to use slackware, but it was an old version, full of holes
and it got hacked so I loaded RedHat, but I'm hoping it's
easier to configure for ppp dialups than slackware was as
that took me ages and my brains buffers have been flushed
as I haven't used that info for so long. Are there any
RPMS that will do this nicely? or do I have to configure
it via the old howto?
I've just been poking around with linuxconf, but haven't
made a lot of progress yet.
If anyone could tell me the steps to take with linuxconf,
I'd appreciate it as it looks like it should work. And
finally, if it's not too much trouble, pls fwd any replies
to my email as to expediate things, thanks thanks and thanks
Bill
------------------------------
From: [EMAIL PROTECTED] (Hugo Haas)
Subject: IP forwarding working in one direction only !?
Date: 23 Feb 1999 12:08:26 GMT
Hi.
I have a problem with IP forwarding: packets are forwarded from eth1 to
eth0, but not from eth0 to eth1!
I have the following configuration: (all the machines are in the same
subnet, subnet mask 255.255.255.0)
x.20 ----- ( x.4 --- x.3 ) ----- x.5
Linux
PC 1 eth0 eth1 PC 2
I configured my Linux with IP forwarding, firewalling, etc, enabled.
If I try to ping PC 1 from PC 2, here is what happens:
req req
<------- <-------
PC 1 Linux PC 2
------->
reply
I used "ipchains -I forward -j ACCEPT -l" to log what the firewall sees, and
I got:
Packet log: forward ACCEPT eth0 PROTO=1 10.0.63.5:8 10.0.63.20:0 L=64 S=0x00
I=43632 F=0x0000 T=63
but I did not see anything about the ICMP echo reply sent by PC 1.
Does anybody see what can be wrong? I'm including my configuration file below:
ifconfig lo 127.0.0.1
route add -net 127.0.0.0
IPADDR0=161.71.63.4
IPADDR1=161.71.63.3
NETMASK=255.255.255.0
NETWORK=161.71.63.0
BROADCAST=161.71.63.255
PC1=161.71.63.20
PC2=161.71.63.5
ifconfig eth0 ${IPADDR0} pointopoint ${PC1} netmask ${NETMASK} broadcast
${BROADCAST}
ifconfig eth1 ${IPADDR1} pointopoint ${PC2} netmask ${NETMASK} broadcast
${BROADCAST}
route add -host ${IPADDR0} metric 1 dev eth0
route add -host ${IPADDR1} metric 1 dev eth1
route add -host ${PC1} metric 1 dev eth0
route add -host ${PC2} metric 1 dev eth0
arp -i eth0 -Ds ${PC2} eth0 pub
arp -i eth1 -Ds ${PC1} eth1 pub
echo "1" > /proc/sys/net/ipv4/tcp_syncookies
(it actually seems that ifconfig's pointopoint does not do anything with a
2.2 kernel)
which gives me the following routing table:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
161.71.63.5 * 255.255.255.255 UH 1 0 0 eth1
161.71.63.4 * 255.255.255.255 UH 1 0 0 eth0
161.71.63.20 * 255.255.255.255 UH 1 0 0 eth0
161.71.63.3 * 255.255.255.255 UH 1 0 0 eth1
localnet * 255.255.255.0 U 0 0 0 eth0
localnet * 255.255.255.0 U 0 0 0 eth1
(routes to localnet are added automatically, but removing the does not
change anything)
I'm sure I made a stupid mistake somewhere, but I can't see what is wrong.
Thank you for any help.
Hugo
--
Hugo Haas (http://www.via.ecp.fr/~hugo/)
------------------------------
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End of Linux-Networking Digest
******************************
