Port forwarding revisited

[Ron Peterson]

On Tue, 28 Aug 2001, Bill Horne wrote:

> Thanks to all who responded to my first email. I appreciate the help.
>
> First, I'm in the process of upgrading to 2.2.19 (thanks, ccb).
>
> I'm sorry that I wasn't more clear, so here's a (hopefully) better
> explanation.
>
> I'm using a RH 6.2 machine as a NAT box in between my cable modem and my
> internal network. The usual services (POP, SMTP, HTTP) work fine.
>
> However, I also have a VPN client on one of my internal machines (call
> it Omega for illustration), in order to access Verizon's network from
> home. This client works OK when Omega is connected directly to the cable
> modem, but can't originate a connection when the Linux box is doing
> masquerading.
>
> The SME for this software says that I need to install IPSec passthrough,
> and *that* is what I need the help with. I hope that I've explained it
> better this time.

Oooh.  This stuff gets hairy.  For starters, VPN starts using protocols
you never heard of.  You need to allow UDP port 500.  And protocol type
(not port) 50 and 51.  How you do this with Linux NAT, I'm not sure.

-- 

-Ron-
https://www.yellowbank.com/

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