I have setup of squid ..which was compiled with --enable-delay-pools
option. Works really well but without WCCP.
I enabled WCCP support in the squid config and also enabled wccp
support on my ASA. Setup GRE tunnel etc.
For my testing purpose I am only having ONE client IP go through
WCCP. The problem is I am able to see that client on the GRE1
interface (the requests) of the proxy server but that client is not
getting anything back reply back. Do I need anything in iptables to
allow etc??? do I need to compile with some transparent support?? if
so which one would I use for ASA?
Any help is highly appreciated.
Here is part of my config:
http_port 3128 transparent
wccp2_router 192.168.100.250
wccp_version 4
wccp2_forwarding_method 1
wccp2_return_method 1
wccp2_service standard 0
Additionally here is what I did to setup tunnel:
modprobe ip_gre
iptunnel add gre1 mode gre remote $ASA_IP local $LOCAL_IP dev eth0
ifconfig gre1 inet 127.0.0.2 netmask 255.255.255.0 up
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
echo 0 > /proc/sys/net/ipv4/conf/default/rp_filter
echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
echo 0 > /proc/sys/net/ipv4/conf/eth0/rp_filter
echo 0 > /proc/sys/net/ipv4/conf/lo/rp_filter
echo 0 > /proc/sys/net/ipv4/conf/gre1/rp_filter
iptables -t nat -A PREROUTING -i gre1 -p tcp -m tcp --dport 80 -j
REDIRECT --to-port
3128
I do see the RX counter going up but not the TX on gre1:
gre1 Link encap:UNSPEC HWaddr C0-A8-64-CF-B7-BF-C8-
C2-00-00-00-00-00-00-00-00
inet addr:127.0.0.2 P-t-P:127.0.0.2 Mask:255.255.255.0
UP POINTOPOINT RUNNING NOARP MTU:1476 Metric:1
RX packets:1559 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:83432 (81.4 KiB) TX bytes:0 (0.0 b)
Here is tcpdump output:
[root@squidnclamav etc]# tcpdump -i gre1 host 192.168.100.175 and port
not ssh
tcpdump: WARNING: arptype 778 not supported by libpcap - falling back
to cooked socket
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on gre1, link-type LINUX_SLL (Linux cooked), capture size 96
bytes
14:13:37.615862 IP 192.168.100.175.52257 > cf-in-f99.google.com.http:
S 3689381709:3689381709(0) win 65535 <mss 1460,sackOK,eol>
14:13:45.524999 IP 192.168.100.175.52256 >
bs2.ads.vip.sp1.yahoo.com.http: S 2516726129:2516726129(0) win 65535
<mss 1460,sackOK,eol>
14:13:45.525001 IP 192.168.100.175.52255 >
bs2.ads.vip.sp1.yahoo.com.http: S 878462413:878462413(0) win 65535
<mss 1460,sackOK,eol>
14:13:45.525002 IP 192.168.100.175.52254 >
bs2.ads.vip.sp1.yahoo.com.http: S 1528706489:1528706489(0) win 65535
<mss 1460,sackOK,eol>
14:13:45.525003 IP 192.168.100.175.52253 >
bs2.ads.vip.sp1.yahoo.com.http: S 1578413587:1578413587(0) win 65535
<mss 1460,sackOK,eol>
14:13:47.427509 IP 192.168.100.175.52252 >
mc2b.mail.vip.re1.yahoo.com.http: S 3796070861:3796070861(0) win 65535
<mss 1460,sackOK,eol>
14:13:47.886251 IP 192.168.100.175.52259 >
f1.www.vip.sp1.yahoo.com.http: S 1111547104:1111547104(0) win 65535
<mss 1460,nop,wscale 3,nop,nop,timestamp 322113293 0,sackOK,eol>
14:13:48.127001 IP 192.168.100.175.52260 > hp-core.ebay.com.http: S
357937093:357937093(0) win 65535 <mss 1460,nop,wscale
3,nop,nop,timestamp 322113295 0,sackOK,eol>
14:13:48.829652 IP 192.168.100.175.52259 >
f1.www.vip.sp1.yahoo.com.http: S 1111547104:1111547104(0) win 65535
<mss 1460,nop,wscale 3,nop,nop,timestamp 322113302 0,sackOK,eol>
14:13:49.029600 IP 192.168.100.175.52260 > hp-core.ebay.com.http: S
357937093:357937093(0) win 65535 <mss 1460,nop,wscale
3,nop,nop,timestamp 322113304 0,sackOK,eol>
14:13:49.820922 IP 192.168.100.175.52259 >
f1.www.vip.sp1.yahoo.com.http: S 1111547104:1111547104(0) win 65535
<mss 1460,nop,wscale 3,nop,nop,timestamp 322113312 0,sackOK,eol>
14:13:50.030914 IP 192.168.100.175.52260 > hp-core.ebay.com.http: S
357937093:357937093(0) win 65535 <mss 1460,nop,wscale
3,nop,nop,timestamp 322113314 0,sackOK,eol>
