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Old 6th August 2011
wlm2 wlm2 is offline
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Default networking configuration help!!

i need to know if i can implement NAT with dynamic ip address
Assigned to my WAN interface ?

this is the topology that i want to achieve:
the pc behind my LAN interface (vr0) will be received an ip address by DHCP server that will be configured on the alix board.

my WAN interface (vr1) will be defined as DHCP Client
and will be received an public ip address via the modem

the part that i can't figured out is the NAT from privet ip address from the pc's behind the lan interface to use the public ip address that assigned by the modem DHCP Server.

I'd appreciate your help asap and examples are more then welcome.
thanks in advance.
matthew.
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Old 6th August 2011
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jggimi jggimi is offline
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The answer you seek, including an example, are found right within the PF User's Guide, which is an adjunct document of the OpenBSD FAQ.

Quote:
When specifying an interface name for the translation address as above, the IP address is determined at pf.conf load time, not on the fly. If you are using DHCP to configure your external interface, this can be a problem. If your assigned IP address changes, NAT will continue translating outgoing packets using the old IP address. This will cause outgoing connections to stop functioning. To get around this, you can tell PF to automatically update the translation address by putting parentheses around the interface name:
pass out on tl0 from dc0:network to any nat-to (tl0)
See the complete chapter from the PF User's Guide on Network Address Translation if you need more information.
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Old 6th August 2011
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Here's a link to the PF User's Guide, in case you need it.
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