Hi, As suggested by Amos...I've configured squid box with bellow mentioned config.
I followed this doc http://wiki.squid-cache.org/ConfigExamples/Intercept/LinuxDnat 1. Configured iptables as: Table: filter Chain INPUT (policy ACCEPT) num target prot opt source destination Chain FORWARD (policy ACCEPT) num target prot opt source destination Chain OUTPUT (policy ACCEPT) num target prot opt source destination Table: mangle Chain PREROUTING (policy ACCEPT) num target prot opt source destination 1 DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3129 Chain INPUT (policy ACCEPT) num target prot opt source destination Chain FORWARD (policy ACCEPT) num target prot opt source destination Chain OUTPUT (policy ACCEPT) num target prot opt source destination Chain POSTROUTING (policy ACCEPT) num target prot opt source destination Table: nat Chain PREROUTING (policy ACCEPT) num target prot opt source destination 1 ACCEPT tcp -- 10.58.200.33 0.0.0.0/0 tcp dpt:80 2 DNAT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 to:10.58.200.33:3129 Chain POSTROUTING (policy ACCEPT) num target prot opt source destination 1 MASQUERADE all -- 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) num target prot opt source destination 2. squid with http_port 3129 intercept 3. PCAP result "3","1.539609","10.210.83.247","10.58.200.33","TCP","68","28754→80 [SYN] Seq=0 Win=8192 Len=0 MSS=1360 WS=256 SACK_PERM=1" "4","1.539680","10.58.200.33","10.210.83.247","TCP","68","80→28754 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 WS=64" "19","2.717863","10.58.200.33","10.210.83.247","TCP","68","[TCP Retransmission] 80→28754 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 WS=64" "31","7.613768","10.210.83.247","10.58.200.33","TCP","64","[TCP Spurious Retransmission] 28754→80 [SYN] Seq=0 Win=8192 Len=0 MSS=1360 SACK_PERM=1" "32","7.613835","10.58.200.33","10.210.83.247","TCP","68","[TCP Retransmission] 80→28754 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 WS=64" "43","8.917825","10.58.200.33","10.210.83.247","TCP","68","[TCP Retransmission] 80→28754 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 WS=64" "167","20.917840","10.58.200.33","10.210.83.247","TCP","68","[TCP Retransmission] 80→28754 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 WS=64" "485","44.917837","10.58.200.33","10.210.83.247","TCP","68","[TCP Retransmission] 80→28754 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 WS=64" "962","93.117870","10.58.200.33","10.210.83.247","TCP","68","[TCP Retransmission] 80→28754 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 WS=64" -- Thanks & Regards Jaykbvt On Wed, Apr 8, 2015 at 2:50 PM, Jaydeep Kubavat <jayk...@gmail.com> wrote: > Hi, > > I've configured a transparent squid proxy on a centos 6.6 with single NIC. > > There is Cisco ISG in between with L4 redirection on www traffic. > > The requests are coming on port 80 from client and ISG forwards that to > port 80 on my squid server. > > So there is no iptables configured on squid server. > > Client requests are not reaching upto my squid instance. > > I'm getting the following in pcap on squid box. > > ========================= > > "129","79.114808","10.210.83.246","10.58.200.33","TCP","76","39546→80 > [SYN] Seq=0 Win=14600 Len=0 MSS=1360 SACK_PERM=1 TSval=2686675 TSecr=0 > WS=64" > > "130","79.114946","10.58.200.33","10.210.83.246","TCP","76","80→39546 > [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 MSS=1460 SACK_PERM=1 TSval=509402603 > TSecr=2686675 WS=64" > > "145","82.115674","10.210.83.246","10.58.200.33","TCP","76","[TCP Spurious > Retransmission] 39546→80 [SYN] Seq=0 Win=14600 Len=0 MSS=1360 SACK_PERM=1 > TSval=2686976 TSecr=0 WS=64" > > "146","82.115748","10.58.200.33","10.210.83.246","TCP","76","[TCP > Retransmission] 80→39546 [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 MSS=1460 > SACK_PERM=1 TSval=509405604 TSecr=2686675 WS=64" > > "151","83.113859","10.58.200.33","10.210.83.246","TCP","76","[TCP > Retransmission] 80→39546 [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 MSS=1460 > SACK_PERM=1 TSval=509406603 TSecr=2686675 WS=64" > > "165","88.145376","10.210.83.246","10.58.200.33","TCP","76","[TCP Spurious > Retransmission] 39546→80 [SYN] Seq=0 Win=14600 Len=0 MSS=1360 SACK_PERM=1 > TSval=2687578 TSecr=0 WS=64" > > "166","88.145450","10.58.200.33","10.210.83.246","TCP","76","[TCP > Retransmission] 80→39546 [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 MSS=1460 > SACK_PERM=1 TSval=509411634 TSecr=2686675 WS=64" > > "176","89.113837","10.58.200.33","10.210.83.246","TCP","76","[TCP > Retransmission] 80→39546 [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 MSS=1460 > SACK_PERM=1 TSval=509412603 TSecr=2686675 WS=64" > > "285","101.113833","10.58.200.33","10.210.83.246","TCP","76","[TCP > Retransmission] 80→39546 [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 MSS=1460 > SACK_PERM=1 TSval=509424603 TSecr=2686675 WS=64" > > ========================= > > my squid is configured default, only > > http_port 3130 > http_port 80 intercept > > are changed. > > > > -- > Thanks & Regards > Jaykbvt > -- Thanks & Regards Jaykbvt
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