On Sat, 2003-09-06 at 12:40, Jeremy Davis wrote:
Ok my problem is when I add a port redirection in the prerouting chain so
that port 80 traffic goes to a certain box. I used this rule
iptables -t nat -I PREROUTING -i ppp0 -p tcp --dport 80 -j DNAT --to
192.168.0.5:80
but this kills all lan http traffic from getting back in to the
workstations. What am I missing?
Jeremy
This says that all the traffic coming to ppp0 detsined to port 80( as you have not specifed the destination ip) will be redirected to 192.168.0.5 on port 80.
So make sure that this what you wanted. Else give destination ip with the above rule.
Regards
Dharmendra.T
dharmu@xxxxxxxxxxx
Linux Security and Administrator.
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Here is my nat table
Chain PREROUTING (policy ACCEPT 11624 packets, 749K bytes)
pkts bytes target prot opt in out source
destination
0 0 DNAT tcp -- any any anywhere anywhere
tcp dpt:dnsix to:192.168.0.5:80
0 0 DNAT tcp -- any any anywhere anywhere
tcp dpt:cadlock to:192.168.0.5:1000
2 120 DNAT tcp -- ppp0 any anywhere anywhere
tcp dpt:ftp to:192.168.0.5:21
3 144 DNAT tcp -- any any anywhere anywhere
tcp dpt:telnet to:192.168.0.5:23
Chain POSTROUTING (policy ACCEPT 12 packets, 780 bytes)
pkts bytes target prot opt in out source
destination
9770 490K MASQUERADE all -- any ppp0 anywhere
anywhere
Chain OUTPUT (policy ACCEPT 43 packets, 2737 bytes)
pkts bytes target prot opt in out source
destination
Here is my filter table
Chain INPUT (policy ACCEPT 5427 packets, 393K bytes)
pkts bytes target prot opt in out source
destination
823 75341 ACCEPT icmp -- ppp0 any anywhere anywhere
423 52420 ACCEPT all -- ppp0 any anywhere anywhere
state RELATED,ESTABLISHED
0 0 ACCEPT tcp -- ppp0 any anywhere anywhere
tcp dpt:ssh
348 59851 LOG all -- ppp0 any anywhere anywhere
LOG level warning
348 59851 REJECT all -- ppp0 any anywhere anywhere
reject-with icmp-port-unreachable
Chain FORWARD (policy DROP 80 packets, 3840 bytes)
pkts bytes target prot opt in out source
destination
0 0 ACCEPT tcp -- ppp0 eth1 anywhere anywhere
tcp dpt:cadlock
0 0 ACCEPT tcp -- ppp0 eth1 anywhere anywhere
tcp dpt:http
18 1001 ACCEPT tcp -- ppp0 eth1 anywhere anywhere
tcp dpt:ftp
3444 140K ACCEPT tcp -- ppp0 eth1 anywhere anywhere
tcp dpt:telnet
113K 19M ACCEPT all -- eth1 ppp0 anywhere anywhere
126K 94M ACCEPT all -- ppp0 eth1 anywhere anywhere
state RELATED,ESTABLISHED
