Hey Jordan, I am running a similar config with wccp and CentOS 6.3 with Cisco routers. Your config looks close to what I have but I use the built-in gre0 tunnel so don't have the interface explicitly setup just have it in rc.local like this: ifconfig gre0 inet 1.2.3.4 netmask 255.255.255.0 up echo 1 > /proc/sys/net/ipv4/ip_forward (same iptables statement as you have) iptables -F -t nat iptables -t nat -A PREROUTING -i gre0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 10.80.166.227:3127 From the router - I did not set the config up but have to documentation and have these additional statements defined to force http traffic to the squid - 166.227) access-list wccp-servers extended permit ip host 10.80.166.227 any access-list wccp-traffic extended permit tcp object-group DM_INLINE_NETWORK_7 any eq www wccp web-cache redirect-list wccp-traffic group-list wccp-servers hope this helps.... -----Original Message----- From: Jordan Dalley [mailto:jdalley@xxxxxxxxxxxxxxxxxxx] Sent: Monday, September 23, 2013 6:17 AM To: Subject: WCCP issues with Centos 6.3 and Cisco 2901 Hi Squid community, I have an issue whereby I am just struggling to find out why it wont work. I have trawled through multiple forums, howto's, faq's etc but no matter what I do, I cannot get it to work properly. Here is what I have done so far: Router IP: 10.114.3.34 Squid IP: 10.112.4.4 WAN Subnet: 10.112.0.0 / 255.252.0.0 Squid Config: http_port 3127 intercept wccp2_router 10.114.3.34 wccp2_forwarding_method gre wccp2_return_method gre wccp2_service standard 0 Confirm I can access and use port 3127 directly without issue from any location in the WAN. Router Config: ip wccp web-cache interface G0/1 !Inside interface ip wccp web-cache redirect in Added to sysctl.conf: # Controls IP packet forwarding net.ipv4.ip_forward = 1 # Controls source route verification net.ipv4.conf.default.rp_filter = 0 net.ipv4.conf.eth0.rp_filter = 0 net.ipv4.conf.eth0.ip_filter = 0 net.ipv4.conf.gre0.rp_filter = 0 net.ipv4.conf.gre0.ip_filter = 0 Added to /etc/sysconfig/network-scripts/ifcfg-gre0 DEVICE=gre0 BOOTPROTO=static IPADDR=127.0.0.2 NETMASK=255.255.255.0 ONBOOT=YES IPV6INIT=NO Linux Configuration: modprobe ip_gre ifup gre0 iptables -t nat -F iptables -t nat -A PREROUTING -i gre0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 10.112.4.4:3127 If, I then do a tcpdump -i gre0 I can see packets flowing through this interface with destination port 80. Unfortunately it seems as if they are somehow not being natted to the squid server. I've tried different varying methods of doing this, but none of them seem to work. Does anyone have any ideas? Regards, Jordan. ______________________________________________________ NIPRO GLASS ______________________________________________________ CAUTION - This message may contain privileged and confidential information intended only for the use of the addressee named above. If you are not the intended recipient of this message you are hereby notified that any use, dissemination, distribution or reproduction of this message is prohibited. If you have received this message in error please notify NIPRO GLASS immediately. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of NIPRO GLASS.
