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Azerix
Guru
Joined: 19 Dec 2004
Posts: 346
Location: NL
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 Posted: Wed Jan 26, 2005 7:59 pm Post subject: Poort Forwarding....probleems |
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Hallo
Usuali i had a normal DHCP, my gentoo was working fine as router and i had normal Internet conection. Today i want try IP forwarding, becouse i am using apache server.
So i try this code.
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iptables -t nat -A PREROUTING -p tcp --dport 80 -i eth1 -j DNAT --to 192.168.0.56
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And now i have no conenction on internet. I think i used wrong code, what do i have to do , to fix this probleem? How kan i remove that from iptables?
.My eth1 is dhcp it gets automatic IP from provider, en eth0 = 192.168.0.1 is static.
Thanks,
Azerix |
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Casper Gasper
Tux's lil' helper
Joined: 07 Sep 2004
Posts: 75
Location: London
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| Posted: Wed Jan 26, 2005 8:49 pm Post subject: |
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Err, not quite sure what you're trying to do! What do you mean by ip forwarding?
I can clearly see why your current web access is broken -- you're redirecting all traffic to port 80 to a machine on your local network.
Casper. |
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Azerix
Guru
Joined: 19 Dec 2004
Posts: 346
Location: NL
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| Posted: Wed Jan 26, 2005 9:04 pm Post subject: |
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ooh,  , i do have intenet conection in router gentoo, i dont have inernet in other client that bount on network, but how can i undo this? i want my internet back  |
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Azerix
Guru
Joined: 19 Dec 2004
Posts: 346
Location: NL
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| Posted: Wed Jan 26, 2005 9:55 pm Post subject: |
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| Can anyone help? i just want to undo, what i just did. |
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forbjok
Apprentice
Joined: 21 May 2004
Posts: 207
Location: Hordaland, Norge
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| Posted: Wed Jan 26, 2005 10:25 pm Post subject: |
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Just remove the rule you added, and things should be back to the way they were.
| Code: | | # iptables -t nat -D PREROUTING -p tcp --dport 80 -i eth1 -j DNAT --to 192.168.0.56 |
should do the trick. (-D is delete, instead of -A, which is add - if it finds a rule matching the specified criteria, it will be deleted, so this should delete the rule you added) |
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Azerix
Guru
Joined: 19 Dec 2004
Posts: 346
Location: NL
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| Posted: Wed Jan 26, 2005 10:29 pm Post subject: |
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i did that , is not working , i get this message :
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iptables: Bad rule (does a matching rule exist in that chain?)
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Azerix
Guru
Joined: 19 Dec 2004
Posts: 346
Location: NL
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| Posted: Wed Jan 26, 2005 11:18 pm Post subject: |
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| has anyone other ideas? |
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forbjok
Apprentice
Joined: 21 May 2004
Posts: 207
Location: Hordaland, Norge
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| Posted: Thu Jan 27, 2005 12:11 am Post subject: |
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It seems your rule was already removed then. If you had your rules saved in rules-save, try
| Code: | | # /etc/init.d/iptables reload |
that should re-read the setup from rules-save.
If it still doesn't work, try:
| Code: | | # iptables -t nat -L -v -n |
What shows up?
If your gateway is running NAT on the local network, there should be a MASQUERADE or SNAT rule in POSTROUTING.
Also, check that /proc/sys/net/ipv4/ip_forward is set to 1. Otherwise, it won't work. |
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