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I recently posted a problem I had with loging on to
Samba with IP Masqurading enabled. The problem is
however more general, It's as follows

Firstly I have an RH6.1 system with the 2.2.16-3
kernel installed. I have a 56k dialup ppp conection
which I start form the server (logged on as any valid
user NOT root).

When logged on I can access the internet from either
of my Windows clients. BUT.


I'm facing the following scenario



I start a download of data off the internet on the
SERVER by any valid method HTTP, FTP etc, and it uses
the TOTAL bandwidth available on my internet
connection. 

I then try to connect to the server from any of my
clients by any method (ie ping, samba authentication,
telnet etc) and the connection times out.

The load on the internet PPP conection on the server
decreases

Now I can see the server again.

My PPP IP is assigned dynamically at connect time.

With IP Masqurading dissabled I have no problems.

This problem has occured with all kernel versions I
have tried so It must be an option I'm missing

The following are my rc.firewall and sysctl.conf files

rc.firewall (Coppied directly from IP Masqurading
HOWTO) (NB the pdf version of this howto cuts the ends
off lines in the script :P  )


#!/bin/sh
  /sbin/depmod -a
  /sbin/modprobe ip_masq_ftp
  /sbin/modprobe ip_masq_raudio
  /sbin/modprobe ip_masq_irc
  echo "1" > /proc/sys/net/ipv4/ip_forward
  echo "1" > /proc/sys/net/ipv4/ip_always_defrag
  echo "1" > /proc/sys/net/ipv4/ip_dynaddr
  /sbin/ipchains -M -S 7200 10 160
  /sbin/ipchains -P forward DENY
  /sbin/ipchains -A forward -s 192.168.1.2/24 -j MASQ 
#IP address of the ethernet adapter connected to my
subnet




sysctl.conf

net.ipv4.ip_forward = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.ip_always_defrag = 1
kernel.sysrq = 0


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