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Duke wrote:
> I need to forward port 110 from my IP Masq gateway to an internal mail
> server at 192.168.1.5. I read the IP Masq howto, section 6.8, and it said
> to issue the following command (with my settings, of course):
>
> ipmasqadm portfw -f
> ipmasqadm portfw -a -P tcp -L 206.172.183.107 110 -R 192.168.1.5 110
>
> It doesn't work. I still get my gateway's port 110 (which isn't open,
> because there's nothing running on it.) I've tried telnetting from my
> gateway to my internal mail server on port 110 with success. I've also
> tried to forward port 23, but I still connect to my gateway.
> I'm running Slack 7.0 with Linux kernel 2.2.15, if more info is required,
> let me know.
i think you've forgotten the ipchains masq commands that are needed before
port forwarding can work:
ipchains -P forward DENY
ipchains -A forward -s 192.168.1.5 -j MASQ
you need this "reverse masq" setup or port forwarding can't work.
but this shouldn't be necessary if you already have something like
ipchains -P forward DENY
ipchains -A forward -s 192.168.1.0/24 -j MASQ
masquerading your whole subnet.
raf
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