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Old 11-24-2005, 03:46 PM   #1
LordNimrod
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NAT - pppoe problems


Hy!
i have a problem and no solution... help please...
and here i go :

i have Mandrake 10 machine with a PPPoE connection to my ISP and a lan connection to my other computers

i want to make NAT so my other computers from lan to have internet access.
so i have eth1(lan): with the ip 10.0.0.200
and ppp0: with ip 17.18.9.64 and it's gateway(80.81.181.3)

i have don NAT and it is working .. but not how it should...

i used iptraf to see what happens when a connection from lan is made this is happening:

the ip from lan 10.0.0.3 connects to 10.0.0.200 -> eth1 .. nat is done and
on ppp0 it gets out with 17.18.9.64 .. ok all good until now but the problem is that it get's out but nothing comes in .. it sends the SYN flag and that's all, it doesn't receive anything back... why not???
 
Old 11-24-2005, 04:14 PM   #2
tlowk
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Registered: Nov 2003
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can you show the iptables rules you use? From your descriptions I don't get
enough information how you are using NAT

I'd use something like this as a start

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

see with
tcpdump -i ppp0


regards,

tlowk
 
Old 11-24-2005, 04:19 PM   #3
LordNimrod
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i use something like this


echo 1 > /proc/sys/net/ipv4/ip_forward

iptables -t nat -A POSTROUTING -o ppp0 -j SNAT --to-source 17.18.9.64
 
  


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