Dear All, I am appreciate your expert advices on this matter :). I have tried with following configuration but it is strange that WCCP2 is not initiated the communication with Cisco Router. I were using this configuration before, wccp2 was working fine. Operation System: CentOS 6.4, x64 bits, Kernel 2.6.32-358.2.1.el6.x86_64 Below is my configuration: 1. Disk mount option /dev/sdb1 /cache1 ext4 defaults,noatime,nodiratime,noacl,barrier=0,data=writeback,commit=100 0 0 /dev/sdc1 /cache2 ext4 defaults,noatime,nodiratime,noacl,barrier=0,data=writeback,commit=100 0 0 /dev/sdd1 /cache3 ext4 defaults,noatime,nodiratime,noacl,barrier=0,data=writeback,commit=100 0 0 /dev/sde1 /cache4 ext4 defaults,noatime,nodiratime,noacl,barrier=0,data=writeback,commit=100 0 0 /dev/sdf1 /cache5 ext4 defaults,noatime,nodiratime,noacl,barrier=0,data=writeback,commit=100 0 0 /dev/sdg1 /cache6 ext4 defaults,noatime,nodiratime,noacl,barrier=0,data=writeback,commit=100 0 0 /dev/sdh1 /cache7 ext4 defaults,noatime,nodiratime,noacl,barrier=0,data=writeback,commit=100 0 0 /dev/sdi1 /cache8 ext4 defaults,noatime,nodiratime,noacl,barrier=0,data=writeback,commit=100 0 0 2. Squid compiled option Squid Cache: Version 3.3.3-20130318-r12517 configure options: '--sysconfdir=/etc/squid' '--enable-follow-x-forwarded-for' '--enable-snmp' '--enable-linux-netfilter' '--enable-http-violations' '--enable-delay-pools' '--enable-storeio=diskd,aufs,ufs,rock' '--with-large-files' '--enable-removal-policies=lru,heap' '--enable-ltdl-convenience' '--with-logdir=/var/log/squid' '--enable-wccpv2' '--with-default-user=squid' '--enable-log-daemon-helpers' '--enable-build-info' '--enable-url-rewrite-helpers' '--enable-async-io=128' 3. Squid Configuration ####################################################### # wccpv2 configuration ####################################################### wccp2_router <wccp router ip> wccp2_forwarding_method 2 wccp2_return_method 2 wccp_version 4 wccp2_assignment_method 2 wccp2_service dynamic 80 password=abc wccp2_service_info 80 protocol=tcp flags=src_ip_hash priority=240 ports=80 wccp2_service dynamic 90 password=abc wccp2_service_info 90 protocol=tcp flags=dst_ip_hash,ports_source priority=240 ports=80 # Rockstore filesytem workers 4 cpu_affinity_map process_numbers=1,2,3,4 cores=1,3,5,7 cache_dir rock /cache1 170000 max-size=31000 cache_dir rock /cache2 170000 max-size=31000 cache_dir rock /cache3 170000 max-size=31000 cache_dir rock /cache4 170000 max-size=31000 cache_dir rock /cache5 170000 max-size=31000 cache_dir rock /cache6 170000 max-size=31000 # AUFS file system if ${process_number}=4 cache_dir aufs /cache7/squid/${process_number} 170000 16 256 min-size=31001 max-size=200000000 cache_dir aufs /cache8/squid/${process_number} 170000 16 256 min-size=31001 max-size=200000000 endif I don't understand which directive impacted on WCCP2 protocol which prevented it from establishing communication with the router. So as result http traffic is not redirected to this squid server :( May you help suggest me what else to check for the bug? --- Regards, Vantha