Date: Wed, 18 Mar 2009 20:49:44 -0700 From: Julian Elischer <julian@elischer.org> To: Lin Zhao <linzhao@ustc.edu.cn> Cc: freebsd-ipfw@freebsd.org Subject: Re: pls help on 3 interfaces Message-ID: <49C1C0D8.2060206@elischer.org> In-Reply-To: <437430175.25503@ustc.edu.cn> References: <437430175.25503@ustc.edu.cn>
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Lin Zhao wrote:
> hi all, wish my english is enough :-)
> my freebsd has 3 interfaces, like this,
>
> ---- ----switch1
> | ---------- fxp0 |
> | | |---------
> internal |--------|freebsd71 |
> | rl0 | |---------
> | ---------- fxp1 |
> ---- ----switch2
first set your routingtable so that teh 'special' addresses
go via switch2, then set up NAT as follows:
like this:
---- ----switch1
| ---------- fxp0 |
| | NAT1(*)|---------
internal |--------|freebsd71 |
| rl0 | NAT2|---------
| ---------- fxp1 |
---- ----switch2
(*) If you want, NAT1 may be left out if you use routable
addresses on your internal network.
The reason for the NAT is to make sure that outgoing packets
have a source address that will make the return packets come back
through switch2, otherwise, even if you have a route
making the outgoing packets go via switch2, the return packets
will still comeback via switch1.
>
> we're in the internal and want to visit outside
> we use fxp0 for default outside address and it works well
> but for some reason, i want to use fxp1 for some special outside address
> how can i do for it?
> thanks a lot.
>
>
> Lin Zhao
> SCGY,USTC,PRC
>
>
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