[squid-users] Sibling peer cache not working, ver 3.5.27

leonyuuu leonyu365 at gmail.com
Thu Dec 12 04:04:32 UTC 2019

Thanks Amos for quick response! It helps a lot in understanding the previous
logs like "forward proxy port not configured", and I adjusted my
configuration later today to do another test. 

However, now the two proxies even doesn't send ICP/HTTP request to each
other anymore for cache digest and the access.log(see below) shows there are
only queries on intercepted traffic. 


My new configuration for proxy0:
    http_port 3128
    http_port 9999 intercept
    icp_access allow all 
    icp_port 3130

    cache_peer sibling 3128 3130
    cache_peer_access allow all
    visible_hostname squid.host.1

Iptables configuration added for proxy0: 
    // for inter-proxy trafic
    "iptables -t nat -A PREROUTING -i veth20 --dport 80 -j REDIRECT
--to-port 3128"
    // for intercepted traffic
    "iptables -t nat -A PREROUTING -i veth12 --dport 80 -j REDIRECT
--to-port 9999"

With tcpdump(see below) listening on the interface that connects the other
proxy, I can see there are established tcp connections between two proxies,
is this traffic for netdb only? I am really wondering what could potentially
prevent from the Cache Digest being exchanged between siblings. 



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