VLANs and DNAT

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Hi Everyone,

I have two interfaces, eth1 and eth2

I have multiple vlans on a eth1, that is, eth1.1 and eth1.2, eth1.3

Eth2 is the external interface to the internet.

   Vlan1 uses the following network address:    192.168.50.0/24
   Vlan2 uses the following network address:    192.168.50.0/24 also

Vlan3 uses the following network address: 192.168.10.0/24

I have NAT working for the vlans, that is, clients are able to access the external internet using nat.

However, there are servers on Vlan2 which I would like to forward traffic to from the external interface, I would imagine that I could do something like:

iptables -A PREROUTING -t nat -p tcp -d 203.221.181.27 --dport 80 -j DNAT --to 192.168.50.10:80

But I cannot specify an interface -i eth1.2 in the prerouting, because it occurs pre-routing?

How can I forward traffic to a host on a vlan when the vlans don't use unique addressing schemes?.. I was thinking I may have to -j REDIRECT the traffic to another chain, and forward it from there?

Any Ideas or solutions would be most appreciated :)

Thanks in advance,
   Damien Mason



--


Best Regards,


Damien Mason
SuSE Systems Specialist

SuSE Linux Asia-Pacific
2-6 Waltham Street
Artarmon, NSW 2064, Australia

Telephone: (612) 943 943 94 ext 246
Facsimile: (612) 9437 3839
Email: kinetic@xxxxxxxxxxx <mailto:kinetic@xxxxxxxxxxx?subject=Reply%20Email>
Web: http://www.suse.net.au./




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