Re: Transparent proxying?

Jim Willette (
Tue, 29 Apr 1997 17:45:38 -0400

I upgraded to v2.0.30 and do not have a problem with transparent proxy
redirects. I did however, patch the kernel with the latest
ip_masqurading patch. It is advailable at the IP_masqurade resource web
page. (you'll have to do a web serach I don't know the URL).

Tuomo Pyhala wrote:
> Wen we did some HW upgrades and switched from kernel 2.0.29 to 2.0.30, the
> transparent proxying feature stopped working. Following rule
> ipfwadm -I -a accept -P tcp -D 80 -r 81
> is used to redirect all http requests to our proxy. However, the
> connection from ppp-client gets refused, though it can directly telnet to
> 81 port of server, and no matter if i change 81 to another port, the
> connection still gets refused. If i remove the rule, everything seems to
> work fine, so what is the problem?
> Is this a (kernel) bug, or is this my fault?
> P.S: I've enabled both SYN-flood protections, could they conflict or
> something?

Jim Willette                    Cornerstone Technologies
Network Consultant/Programmer