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Hello All, I’m trying to set up a transparent proxy for http and https using Cisco Routers and Squid. I have followed the configuration examples that are listed under the wccp2 overview section (http://wiki.squid-cache.org/Features/Wccp2)
of the squid wiki but I’m still having some issues. I have a little lab set up with a Cisco 7200 Router and a VM with CentOS running the proxy.
The “WAN” IP of the Router is 192.168.0.23. The IP of the Squid Proxy is 192.168.0.24 and both have the default gateway of 192.168.0.1 which is the “ISP” The Client is sitting on a LAN behind the Router in the 10.10.10.0/24 subnet and is also sitting behind nat. I believe that the router and proxy are communicating properly based on the information in the show ip wccp command on the router as it shows clients and routers as well as showing that packets are being forwarded: R3#show ip wccp Global WCCP information: Router information: Router Identifier: 192.168.0.23 Configured source-interface: GigabitEthernet5/0 Service Identifier: web-cache Protocol Version: 2.00 Number of Service Group Clients: 1 Number of Service Group Routers: 1 Total Packets Redirected: 1079 Process: 0 CEF: 1079 Service mode: Open Service Access-list: -none- Total Packets Dropped Closed: 0 Redirect access-list: 100 Total Packets Denied Redirect: 0 Total Packets Unassigned: 0 Group access-list: 10 Total Messages Denied to Group: 0 Total Authentication failures: 0 Total GRE Bypassed Packets Received: 0 Process: 0 CEF: 0 GRE tunnel interface: Tunnel1 Service Identifier: 70 Protocol Version: 2.00 Number of Service Group Clients: 1 Number of Service Group Routers: 1 Total Packets Redirected: 500 Process: 0 CEF: 500 Service mode: Open Service Access-list: -none- Total Packets Dropped Closed: 0 Redirect access-list: 100 Total Packets Denied Redirect: 0 Total Packets Unassigned: 0 Group access-list: 10 Total Messages Denied to Group: 0 Total Authentication failures: 0 Total GRE Bypassed Packets Received: 0 Process: 0 CEF: 0 GRE tunnel interface: Tunnel0 Here is the relevant squid wccp configuration: ----Output removed---- # Squid normally listens to port 3128 http_port 3128 http_port 0.0.0.0:3129 # WCCPv2 Parameters wccp2_router 192.168.0.23 wccp2_forwarding_method 1 wccp2_return_method 1 wccp2_assignment_method hash wccp2_service standard 0 wccp2_service dynamic 70 wccp2_service_info 70 protocol=tcp flags=dst_ip_hash,src_ip_alt_hash,src_port_alt_hash priority=231 ports=443 ---Output remove---- I think that the issue lies with the iptables configuration as I do not see any packets been processed in the nat table. I have tried a few different methods such as: iptables -t nat -A PREROUTING -i wccp0 -p tcp –dport 80 -j REDIRECT –to-port 3129 iptables -t nat -A PREROUTING -i wccp0 -p tcp –dport 443 -j REDIRECT –to-port 3129 iptables -t nat -A POSTROUTING -j MASQUERADE or iptables -t nat -A PREROUTING -p tcp –dport 80 -j DNAT –to-destination 192.168.0.24:3129 iptables -t nat -A PREROUTING -p tcp –dport 443 -j DNAT –to-destination 192.168.0.24:3129 iptables -t nat -A POSTROUTING -j MASQUERADE I have also tried adding ACCEPT commands to the PREROUTING zone just in case the proxy is dropping the packets right away but that also doesn’t work. The proxy functions perfectly when the client is configured to use a proxy so there doesn’t appear to be any issues with routing or anything like that, it’s just the transparent proxying that isn’t working. If anyone has any suggestions of what I could try that would be greatly appreciated. Let me know if anything is unclear or if you need further clarification.
Thank you, Cooper Waldon Cooper Waldon l Network
Engineer l
OTN
l
416-446-4110 x 4473
l www.otn.ca
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