Thanks all.
Our client IP setting is static, because host program check ip and MAC address.
So I set static ip address all PC.
main offce set 192.168.1.0/24 and sub office set 192.168.3.0/24.
squid IP is 192.168.1.237/24
main office client setting below
IP 192.168.1.X/24
GW 192.168.1.2
DNS 192.168.1.237 (squid box serving DNS service)
IE : proxy 192.168.1.237:3128
check -> local ip not use
sub office client setting below
IP 192.168.3.X/24
GW 192.168.3.1 -> router IP.
DNS 192.168.1.237
IE : proxy 192.168.1.237:3128
check -> local ip not use
DNS is O.K, Not error log
Maybe does 'squid -k rotate'' problem in cron, or wrong setting "cache_mem 64" ?
I don't know why client can't connect squid service..
