topic PBR and port redirection in Network Security

PBR and port redirection

ribin.jones — Mon, 11 Mar 2019 19:39:11 GMT

What does the first line of below acl does for proxy redirect? I hope it denies all traffic except 80 and redirects 80 traffic to proxy ip?

access-list 111 deny tcp any any neq www
access-list 111 deny tcp host 192.168.40.11 any

access-list 111 permit tcp any any

192.168.40.11 is my proxy ip.

This config works for me. But at times, we are not able to access some https sites..For eg, http://gmail.com redirects to https://gmail.com, but it doesnt work all the time.

- Ribin

Re: PBR and port redirection

Jennifer Halim — Mon, 24 Jan 2011 07:47:38 GMT

You are right, if the ACL is applied to the proxy redirection ACL, it does mean what you posted earlier.

Basically, the acl says:

line 1: deny all TCP traffic whose port is not equal to www (port 80)

line 2: deny all TCP traffic from the proxy server

line 3: permit all TCP outbound traffic

Since line 1 already deny all TCP ports but port 80, line 3 essentially means permit TCP/80.

So in summary, redirect all TCP/80 traffic except traffic from the proxy serve itself. Everything else will not be redirected.