Dan Johnson wrote:
After beating my head against this for days I ran out of places to look for
information, and almost sent this as a help request instead of an
observation. So excuse the present tense.
All I am actually trying to accomplish is a simple (This worked flawless
last i tried under 4.5) squid transparent proxy.
so, what revision are you trying to do this on?
I think in 6.1 it was disabled without an extra option. (see in LINT)
I'm using this rule before the nat rule:
00100 fwd 127.0.0.1,3128 log ip from any to any 80 out
When I attempt to hit port 80 on an external server, the security log shows
the rule was processed, and claims it was forwarded to 127.0.0.1,3128. OK
Watching tcpdump -nnvvei lo0 shows no relevant activity. BUT, watching
tcpdump -nnvvei xl1 (external iface) shows the port 80 SYN being sent to the
remote web server with the original source ip address from 192.168.0.0/24,
still using the destination MAC of my default gateway. This is with or
without the squid daemon running. And when i do have it running i have it on
the local console with debugging enabled (incase a stray packet actually
makes it in.)
that sounds a bit like the problem I mention above...
however, sending it to 127.0.0.1 doesn't mean it goes through lo0 so
you'll never see it there.
The same holds true if i setup the fwd to my xl1 interface ip address, or
another host ex 192.168.0.30.
Running tcpdump (Linux) eth0 in promisc on 192.168.0.30 also doesn't show
any traffic being forwarded its way when configured to do so. So I'm
inclined to beleive this isn't just an error on tcpdumps part (as there is
an open issue reported with tcpdump and ipfw fwd) but that the traffic
really isn't being modified.
The only thing I was doing that is unique is I recompiled the ipfw module to
include -DIPFIREWALL_NAT and -DIPFIREWALL_FORWARD instead of adding the
whole mess to the base kernel.
ah that will fail because the IPFIREWALL_FORWARD option has to change
things in teh tcp and Ip code too.
After noting that I was using a module, I said screw it, and compiled IPFW
into the base kernel, viola now it works fine.
yeah the whole ip stack need to be compiled with those options..
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