RE: [squid-users] transparent proxy not working!! any advice?

ip_gre is enough...the IP_WCCP module was used prior to gre support in the kernel. CentOS 5 is new enough that that it uses a kernel that is gre capable.
 
I have found that there are routing problems with some IOS versions because the squid cache may be sitting on a IP subnet that is not directly connected to the ip subnet the squid box is on.
 
The way to check on this is to see if the "Router Identifier" in the "sh ip wccp" output on the router shows an IP address that is on the same IP subnet as the squid box.
 
The solution is to make sure they are the same IP subnet, or update your IOS. I know the problem was fixed at or around IOS version 12.4(15)T3. I happen to be running (C2800NM-ADVSECURITYK9-M), Version 12.4(15)T3 and the problem is no longer there. But initially I was having the problem with an earlier 12.4 version of SPServices IOS.
 
Nick

________________________________

From: R_O_L_A_N_D_at_hotmail.com [mailto:R_O_L_A_N_D_at_hotmail.com]
Sent: Thu 1/8/2009 9:44 AM
To: Ritter, Nicholas
Cc: squid-users_at_squid-cache.org
Subject: Re: [squid-users] transparent proxy not working!! any advice?

Nicholas

ports are open now, however I'm still not seeing traffic on the tunnel
(tcpdump -i gre0). Also I'm not certain if the ip_gre module is enough. I'm
seeing many configurations using ip_wccp, but I do not have that one on my
centos
What is the proper way to verify that tunnel is working properly? I tried to
create 2 VMs, and setup a GRE tunnel between them, and it worked.

--------------------------------------------------
From: "Ritter, Nicholas" <Nicholas.Ritter_at_americantv.com>
Sent: Tuesday, January 06, 2009 11:25 PM
To: "Roland Roland" <R_O_L_A_N_D_at_hotmail.com>
Cc: <squid-users_at_squid-cache.org>
Subject: RE: [squid-users] transparent proxy not working!! any advice?

> Ok...so the squid server and the router are seeing eachother
> initially....then it fails. On the squid box you need to make sure the
> firewall is allowing UDP port 2048 from the the router and that the GRE
> tunnel is functioning properly, and is setup in iptables properly.
>
> The other issue is that may be needed is that access-list (access-list
> 180, from my last email) should have the ip of the squid box in it as a
> deny entry. The reason for this is that you want to avoid traffic being
> 'looped' from the router to the squid box.
>
> You can setup WCCP where you are using no service groups and just the
> web-cache and web-cache redirect, etc. The two things that can break doing
> that are: multiple squid servers in a WCCP setup, and support for
> apps/ports other than port 80.
>
> Nick
>
> ________________________________
>
> From: Roland Roland [mailto:R_O_L_A_N_D_at_hotmail.com]
> Sent: Tue 1/6/2009 1:48 PM
> To: Ritter, Nicholas; squid_at_vdvyver.net
> Cc: squid-users_at_squid-cache.org
> Subject: Re: [squid-users] transparent proxy not working!! any advice?
>
>
>
> Hello,
>
> after adding the ACL below.
> I've got the following result.
> if im not mistaken, it has something to due with the "dynamic" issue?
> should
> I set it as standard 0
> or ?!
>
> *Jan 6 20:21:39.294: WCCP-PKT:D90: Sending I_See_You packet to
> 192.168.0.183 w/ rcv_id 00000019
> *Jan 6 20:21:39.298: WCCP-PKT:D80: Sending I_See_You packet to
> 192.168.0.183 w/ rcv_id 00000019
> *Jan 6 20:21:57.290: WCCP-EVNT:D90: Here_I_Am packet from 192.168.0.183
> w/bad rcv_id 00000000
> *Jan 6 20:21:57.290: WCCP-PKT:D90: Sending I_See_You packet to
> 192.168.0.183 w/ rcv_id 0000001A
> *Jan 6 20:21:57.290: WCCP-EVNT:D80: Here_I_Am packet from 192.168.0.183
> w/bad rcv_id 00000000
> *Jan 6 20:21:57.290: WCCP-PKT:D80: Sending I_See_You packet to
> 192.168.0.183 w/ rcv_id 0000001A
> *Jan 6 20:22:04.294: WCCP-PKT:D90: Sending Removal_Query packet to
> 192.168.0.183w/ rcv_id 0000001B
> *Jan 6 20:22:04.298: WCCP-PKT:D80: Sending Removal_Query packet to
> 192.168.0.183w/ rcv_id 0000001B
> *Jan 6 20:22:09.294: %WCCP-1-SERVICELOST: Service 90 lost on WCCP client
> 192.168.0.183
> *Jan 6 20:22:09.298: %WCCP-1-SERVICELOST: Service 80 lost on WCCP client
> 192.168.0.183
> *Jan 6 20:22:15.298: WCCP-PKT:D90: Sending I_See_You packet to
> 192.168.0.183 w/ rcv_id 0000001C
> *Jan 6 20:22:15.298: WCCP-PKT:D80: Sending I_See_You packet to
> 192.168.0.183 w/ rcv_id 0000001C
>
> --------------------------------------------------
> From: "Roland Roland" <R_O_L_A_N_D_at_hotmail.com>
> Sent: Monday, January 05, 2009 9:50 PM
> To: "Ritter, Nicholas" <Nicholas.Ritter_at_americantv.com>;
> <squid_at_vdvyver.net>
> Cc: <squid-users_at_squid-cache.org>
> Subject: Re: [squid-users] transparent proxy not working!! any advice?
>
>>
>> Hello,
>> thanks for the advice ill proceed and add the new ACL.
>> in the meantime, to answer your question
>> yes Squid is on the same interface as all the other clients. what sort of
>> entries should I add to tht access list?
>>
>> PS: my IOS is Version 12.4(17b), RELEASE SOFTWARE (fc2) Cisco 2811
>> (revision 53.51)
>>
>>
>> --------------------------------------------------
>> From: "Ritter, Nicholas" <Nicholas.Ritter_at_americantv.com>
>> Sent: Monday, January 05, 2009 9:23 PM
>> To: <R_O_L_A_N_D_at_hotmail.com>; <squid_at_vdvyver.net>
>> Cc: <squid-users_at_squid-cache.org>
>> Subject: RE: [squid-users] transparent proxy not working!! any advice?
>>
>>> The error on the Cisco router is stating that the squid box is trying to
>>> tell the router that it is able to service the wccp group 80 and 90, but
>>> for some reason the router does not see those groups as ones it is
>>> servicing.
>>>
>>> This is odd. Try doing the following in the router:
>>>
>>> ip access-list 180 permit any any
>>> ip wccp web-cache redirect-list 180
>>> ip wccp 80 redirect-list 180
>>> ip wccp 90 redirect-list 180
>>>
>>> Is the squid box on the same router interface as the rest of the
>>> clients?
>>> If it is, you may need to add lines to the access-list 180, or put the
>>> squid box on the secondary interface of the router and do a "ip wccp
>>> redirect exclude in" statement on that interface.
>>>
>>> Which IOS feature set and version is this?
>>>
>>> WCCP is buggy in some IOS releases.
>>>
>>>
>>>
>>> ________________________________
>>>
>>> From: R_O_L_A_N_D_at_hotmail.com [mailto:R_O_L_A_N_D_at_hotmail.com]
>>> Sent: Mon 1/5/2009 8:43 AM
>>> To: squid_at_vdvyver.net
>>> Cc: squid-users_at_squid-cache.org
>>> Subject: Re: [squid-users] transparent proxy not working!! any advice?
>>>
>>>
>>>
>>> Hello,
>>> actually I have both of set on the lan interface ( am I mistaken to set
>>> the
>>> "redirect out" on the lan interface? should I be setting it on the
>>> interface
>>> facing the internet?)
>>>
>>> ip wccp 80 redirect in
>>> ip wccp 90 redirect out
>>>
>>> as for the wiki provided, I fail to see what's missing!
>>> obviously there is something, but I'm not detecting it!
>>>
>>>
>>>
>>> --------------------------------------------------
>>> From: "Regardt van de Vyver" <squid_at_vdvyver.net>
>>> Sent: Monday, January 05, 2009 12:46 AM
>>> Cc: <squid-users_at_squid-cache.org>
>>> Subject: Re: [squid-users] transparent proxy not working!! any advice?
>>>
>>>> Roland Roland wrote:
>>>>> Hello,
>>>>> the output of the debugging is as such:
>>>>>
>>>>>
>>>>>
>>>>> *Jan 4 23:16:43.205: WCCP-EVNT:D90: Here_I_Am packet from
>>>>> 192.168.0.183:
>>>>> service not active
>>>>> *Jan 4 23:16:43.205: WCCP-EVNT:D80: Here_I_Am packet from
>>>>> 192.168.0.183:
>>>>> service not active
>>>>>
>>>>> what service is that?!
>>>>>
>>>>>
>>>>>
>>>>> --------------------------------------------------
>>>>> From: "Regardt van de Vyver" <squid_at_vdvyver.net>
>>>>> Sent: Sunday, January 04, 2009 9:33 PM
>>>>> Cc: <squid-users_at_squid-cache.org>
>>>>> Subject: Re: [squid-users] transparent proxy not working!! any advice?
>>>>>
>>>>>> Roland Roland wrote:
>>>>>>> i've just created a new box with the following options:
>>>>>>> but wccp with router is still not working!
>>>>>>> any advice?
>>>>>>>
>>>>>>>
>>>>>>> using centos 5.2
>>>>>>> and squid 2.6
>>>>>>> firewall enabled
>>>>>>> SElinux permissive
>>>>>>> -------------------------------------------------------
>>>>>>> done the following:
>>>>>>>
>>>>>>> yum update yum
>>>>>>>
>>>>>>> yum install squid
>>>>>>>
>>>>>>> squid -z
>>>>>>> -------------------------------------------------------
>>>>>>> gedit /etc/rc.d/init.d/rc.local
>>>>>>>
>>>>>>> #added:
>>>>>>> modprobe ip_gre
>>>>>>> ifconfig gre0 192.168.0.183 netmask 255.255.255.0 up
>>>>>>> #this is the same ip as my eth0
>>>>>>>
>>>>>>> ----------------------------------------------------
>>>>>>> gedit /etc/sysconfig/iptables
>>>>>>>
>>>>>>> #added:
>>>>>>> -A INPUT -i gre0 -j ACCEPT
>>>>>>> -A INPUT -i gre0 -j ACCEPT
>>>>>>> -A INPUT -p gre -j ACCEPT
>>>>>>> #my routers lan interface 192.168.0.1
>>>>>>> -A RH-Firewall-1-INPUT -s 192.168.0.1/24 -p udp -m udp --dport
>>>>>>> 2048 -j
>>>>>>> ACCEPT
>>>>>>> -------------------------------------------------------
>>>>>>> service iptables condrestart
>>>>>>> --------------------------------------------------------
>>>>>>> gedit /etc/squid/squid.conf
>>>>>>>
>>>>>>> #edited/added the follwoing:
>>>>>>> http_port 80 transparent
>>>>>>> http_access allow all
>>>>>>> wccp2_router 192.168.0.1
>>>>>>> wccp_version 4
>>>>>>> wccp2_rebuild_wait on
>>>>>>> wccp2_forwarding_method 1
>>>>>>> wccp2_return_method 1
>>>>>>> wccp2_assignment_method 1
>>>>>>> wccp2_service dynamic 80
>>>>>>> wccp2_service dynamic 90
>>>>>>> wccp2_service_info 80 protocol=tcp flags=src_ip_hash priority=240
>>>>>>> ports=80
>>>>>>> wccp2_service_info 90 protocol=tcp flags=dst_ip_hash,ports_source
>>>>>>> priority=240 ports=80
>>>>>>> ----------------------------------------------------------
>>>>>>> Cisco router 2811 side:
>>>>>>>
>>>>>>> conf t
>>>>>>> ip wccp version 2
>>>>>>> ip wccp web-cache
>>>>>>>
>>>>>>> int f0/1 (Lan interface)
>>>>>>> ip wccp 80 redirect in
>>>>>>> ip wccp 90 redirect out
>>>>>>> ----------------------------------------------------------
>>>>>>> service squid restart
>>>>>>>
>>>>>>> then sh ip wccp on router gave me all hits as 0 no hits from squid
>>>>>>> to
>>>>>>> router!!
>>>>>>> ----------------------------------------------------------
>>>>>>>
>>>>>>> service iptables status
>>>>>>>
>>>>>>> [root_at_localhost ~]# service iptables status
>>>>>>> Table: filter
>>>>>>> Chain INPUT (policy ACCEPT)
>>>>>>> num target prot opt source destination
>>>>>>> 1 RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> 2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> 3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> 4 ACCEPT 47 -- 0.0.0.0/0 0.0.0.0/0
>>>>>>>
>>>>>>> Chain FORWARD (policy ACCEPT)
>>>>>>> num target prot opt source destination
>>>>>>> 1 RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0
>>>>>>>
>>>>>>> Chain OUTPUT (policy ACCEPT)
>>>>>>> num target prot opt source destination
>>>>>>>
>>>>>>> Chain RH-Firewall-1-INPUT (2 references)
>>>>>>> num target prot opt source destination
>>>>>>> 1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> 2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> icmp
>>>>>>> type
>>>>>>> 255
>>>>>>> 3 ACCEPT esp -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> 4 ACCEPT ah -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> 5 ACCEPT udp -- 0.0.0.0/0 224.0.0.251
>>>>>>> udp
>>>>>>> dpt:5353
>>>>>>> 6 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> udp
>>>>>>> dpt:631
>>>>>>> 7 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> tcp
>>>>>>> dpt:631
>>>>>>> 8 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state
>>>>>>> RELATED,ESTABLISHED
>>>>>>> 9 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state
>>>>>>> NEW
>>>>>>> tcp dpt:22
>>>>>>> 10 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state
>>>>>>> NEW
>>>>>>> tcp dpt:80
>>>>>>> 11 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state
>>>>>>> NEW
>>>>>>> tcp dpt:5900
>>>>>>> 12 ACCEPT udp -- 192.168.0.0/24 0.0.0.0/0
>>>>>>> udp
>>>>>>> dpt:2048
>>>>>>> 13 REJECT all -- 0.0.0.0/0 0.0.0.0/0
>>>>>>> reject-with icmp-host-prohibited
>>>>>>>
>>>>>>>
>>>>>>> ---------------------------------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> lsmod:
>>>>>>>
>>>>>>> Module Size Used by
>>>>>>> ip_conntrack_netbios_ns 6977 0
>>>>>>> xt_state 6209 4
>>>>>>> ip_conntrack 53025 2 ip_conntrack_netbios_ns,xt_state
>>>>>>> nfnetlink 10713 1 ip_conntrack
>>>>>>> iptable_filter 7105 1
>>>>>>> ip_tables 17029 1 iptable_filter
>>>>>>> ip6table_filter 6849 1
>>>>>>> ip6_tables 18053 1 ip6table_filter
>>>>>>> nls_utf8 6208 1
>>>>>>> ip_gre 16737 0
>>>>>>> autofs4 24517 2
>>>>>>> hidp 23105 2
>>>>>>> rfcomm 42457 0
>>>>>>> l2cap 29505 10 hidp,rfcomm
>>>>>>> bluetooth 53797 5 hidp,rfcomm,l2cap
>>>>>>> sunrpc 144893 1
>>>>>>> ipt_REJECT 9537 1
>>>>>>> ip6t_REJECT 9409 1
>>>>>>> xt_tcpudp 7105 15
>>>>>>> x_tables 17349 6
>>>>>>> xt_state,ip_tables,ip6_tables,ipt_REJECT,ip6t_REJECT,xt_tcpudp
>>>>>>> dm_multipath 22089 0
>>>>>>> video 21193 0
>>>>>>> sbs 18533 0
>>>>>>> backlight 10049 1 video
>>>>>>> i2c_ec 9025 1 sbs
>>>>>>> button 10705 0
>>>>>>> battery 13637 0
>>>>>>> asus_acpi 19289 0
>>>>>>> ac 9157 0
>>>>>>> ipv6 258273 17 ip6t_REJECT
>>>>>>> xfrm_nalgo 13765 1 ipv6
>>>>>>> crypto_api 11969 1 xfrm_nalgo
>>>>>>> lp 15849 0
>>>>>>> floppy 57125 0
>>>>>>> i2c_piix4 12237 0
>>>>>>> pcnet32 35141 0
>>>>>>> pcspkr 7105 0
>>>>>>> i2c_core 23745 2 i2c_ec,i2c_piix4
>>>>>>> mii 9409 1 pcnet32
>>>>>>> ide_cd 40033 1
>>>>>>> cdrom 36705 1 ide_cd
>>>>>>> parport_pc 29157 1
>>>>>>> serio_raw 10693 0
>>>>>>> parport 37513 2 lp,parport_pc
>>>>>>> dm_snapshot 21477 0
>>>>>>> dm_zero 6209 0
>>>>>>> dm_mirror 29125 0
>>>>>>> dm_mod 61405 9
>>>>>>> dm_multipath,dm_snapshot,dm_zero,dm_mirror
>>>>>>> ata_piix 22341 0
>>>>>>> libata 143997 1 ata_piix
>>>>>>> sd_mod 24897 0
>>>>>>> scsi_mod 134605 2 libata,sd_mod
>>>>>>> ext3 123593 2
>>>>>>> jbd 56553 1 ext3
>>>>>>> uhci_hcd 25421 0
>>>>>>> ohci_hcd 23261 0
>>>>>>> ehci_hcd 33357 0
>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>> ifconfig:
>>>>>>>
>>>>>>> [root_at_localhost ~]# ifconfig
>>>>>>> eth0 Link encap:Ethernet HWaddr 00:0C:29:F8:D0:AF
>>>>>>> inet addr:192.168.0.183 Bcast:192.168.0.255
>>>>>>> Mask:255.255.255.0
>>>>>>> inet6 addr: fe80::20c:29ff:fef8:d0af/64 Scope:Link
>>>>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>>>>> RX packets:29956 errors:0 dropped:0 overruns:0 frame:0
>>>>>>> TX packets:11948 errors:0 dropped:0 overruns:0 carrier:0
>>>>>>> collisions:0 txqueuelen:1000
>>>>>>> RX bytes:3673892 (3.5 MiB) TX bytes:7234153 (6.8 MiB)
>>>>>>> Interrupt:169 Base address:0x2000
>>>>>>>
>>>>>>> gre0 Link encap:UNSPEC HWaddr
>>>>>>> 00-00-00-00-B2-BF-68-33-00-00-00-00-00-00-00-00
>>>>>>> inet addr:192.168.0.183 Mask:255.255.255.0
>>>>>>> UP RUNNING NOARP MTU:1476 Metric:1
>>>>>>> RX packets:0 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:0 (0.0 b) TX bytes:0 (0.0 b)
>>>>>>>
>>>>>>> lo Link encap:Local Loopback
>>>>>>> inet addr:127.0.0.1 Mask:255.0.0.0
>>>>>>> inet6 addr: ::1/128 Scope:Host
>>>>>>> UP LOOPBACK RUNNING MTU:16436 Metric:1
>>>>>>> RX packets:2926 errors:0 dropped:0 overruns:0 frame:0
>>>>>>> TX packets:2926 errors:0 dropped:0 overruns:0 carrier:0
>>>>>>> collisions:0 txqueuelen:0
>>>>>>> RX bytes:3257748 (3.1 MiB) TX bytes:3257748 (3.1 MiB)
>>>>>>>
>>>>>>> -------------------------------------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>> Hi Roland,
>>>>>>
>>>>>> Have you had a look at the WCCP debugging messages on the Cisco?
>>>>>> eg. on the cisco
>>>>>> debug ip wccp events
>>>>>> debug ip wccp packets
>>>>>> terminal monitor
>>>>>>
>>>>>> That should give you some indication of wccp activity, also what does
>>>>>> "sh ip wccp web-cache detail" show?
>>>>>>
>>>>>> Regardt
>>>>>>
>>>>>>
>>>>>
>>>> Hi Roland,
>>>>
>>>> Off the bat I'd guess its a missing
>>>> "ip wccp 80" and a "ip wccp 90" on the Cisco.
>>>>
>>>> Also, just rechecking your config I'm wondering about missing /proc
>>>> bits
>>>> as per:
>>>> http://wiki.squid-cache.org/ConfigExamples/MultiplePortsWithWccp2
>>>>
>>>> Regardt
>>>>
>>>>
>>>
>>>
>>>
>>>
>>
>
>
>
>
Received on Thu Jan 08 2009 - 18:03:18 MST