Re: [squid-users] RE: WCCP issues with Centos 6.3 and Cisco 2901

Before saying this or that, did you had the chance of looking at:
http://wiki.squid-cache.org/ConfigExamples/UbuntuTproxy4Wccp2
??
What version of IOS the 2901 has on it?

Eliezer

On 09/24/2013 02:31 AM, Jordan Dalley wrote:
> Thanks for your reply Bob,
>
> I tried what you said - completely removed any ifcfg-gre0 config and simply ran the commands:
>
> ifconfig gre0 inet 1.1.1.1 netmask 255.255.255.0 up
> iptables -F -t nat
> iptables -t nat -A PREROUTING -i gre0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 10.112.4.4:3127
>
> On the router side (I had to modify your acl's a bit)
>
> ip access-list standard wccp-servers
> permit host 10.112.4.4
> ip access-list extended wccp-traffic
> permit tcp 10.114.32.0 0.0.7.255 any eq www
>
> ip wccp web-cache redirect-list wccp-traffic group-list wccp-servers
>
> Upon inspection, I can see the router forwarding packets through the gre tunnel:
>
> [root_at_tsv-squid1 ~]# tcpdump -i gre0
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on gre0, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes
> 20:40:04.370754 IP 10.114.32.51.62007 > 190.93.248.164.http: Flags [S], seq 2779756886, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK], length 0
> 20:40:04.370861 IP 10.114.32.51.62008 > 190.93.248.164.http: Flags [S], seq 1665803222, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK], length 0
> 20:40:07.381696 IP 10.114.32.51.62007 > 190.93.248.164.http: Flags [S], seq 2779756886, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK], length 0
> 20:40:07.381779 IP 10.114.32.51.62008 > 190.93.248.164.http: Flags [S], seq 1665803222, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK], length 0
> 20:40:13.387792 IP 10.114.32.51.62007 > 190.93.248.164.http: Flags [S], seq 2779756886, win 8192, options [mss 1460,nop,nop,sackOK], length 0
> 20:40:13.387812 IP 10.114.32.51.62008 > 190.93.248.164.http: Flags [S], seq 1665803222, win 8192, options [mss 1460,nop,nop,sackOK], length 0
>
> Here's the weird thing..
>
> [root_at_tsv-squid1 ~]# ifconfig gre0
> gre0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-82-12-00-00-00-00-00-00-00-00
> inet addr:1.1.1.1 Mask:255.255.255.0
> UP RUNNING NOARP MTU:1476 Metric:1
> RX packets:143 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:7136 (6.9 KiB) TX bytes:0 (0.0 b)
>
> Note my GRE tunnel is not transmitting, only receiving.
>
> I can confirm, ip forwarding is enabled.
>
> [root_at_tsv-squid1 ~]# cat /proc/sys/net/ipv4/ip_forward
> 1
> [root_at_tsv-squid1 ~]#
>
> Cheers,
> J.
>
> -----Original Message-----
> From: Luderitz Bob [mailto:Bob.Luderitz_at_NiproGlassAmericas.com]
> Sent: Tuesday, 24 September 2013 1:38 AM
> To: squid-users_at_squid-cache.org
> Subject: [squid-users] RE: WCCP issues with Centos 6.3 and Cisco 2901
>
> 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_at_tsv.catholic.edu.au]
> Sent: Monday, September 23, 2013 6:17 AM
> To:
> Subject: [squid-users] 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.
>
> ______________________________________________________
>
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>
Received on Tue Sep 24 2013 - 05:30:19 MDT