Squid : sibling not caching, not communicating

Hi all,

I'm trying to create a very simple configuration here: I have one origin server and I want two peer to be set as siblings. I am facing trouble though. When I launch the squid instances at the two peers, I can't get them to work together: From what I saw in access.log, the siblings are not using ICP queries, and therefore not communicating about their cache content (sometimes, at the beginning of my tests I can see one or two ICP queries (in access.log) between the two peers, then, they just stop talking...).

I've tried with a lot of different files, such as .jpg .mpd .gif. I've had one UDP_HIT (on the requested peer) and SIBLING_HIT (on the requesting peer) once (over all my tests) and that's all, I get HIER_DIRECT for the rest of my tests.

I am using the configuration file depicted below (with the cache_peer directive in the end)

I am working on ubuntu 14.04. Any idea what's wrong in my config ? I am really struggling with this and can't see what's wrong here >_<

Code:

# WELCOME TO SQUID 3.3.8

# ----------------------------

# ACCESS CONTROLS

# -----------------------------------------------------------------------------

acl localnet src 10.0.0.0/8 # RFC1918 possible internal network

acl localnet src 172.16.0.0/12 # RFC1918 possible internal network

acl localnet src 192.168.0.0/16 # RFC1918 possible internal network

acl SSL_ports port 443

acl Safe_ports port 80 # http

acl Safe_ports port 21 # ftp

acl Safe_ports port 443 # https

acl Safe_ports port 70 # gopher

acl Safe_ports port 210 # wais

acl Safe_ports port 1025-65535 # unregistered ports

acl Safe_ports port 280 # http-mgmt

acl Safe_ports port 488 # gss-http

acl Safe_ports port 591 # filemaker

acl Safe_ports port 777 # multiling http

acl CONNECT method CONNECT

acl video urlpath_regex -i .m4s$

http_access deny !Safe_ports

http_access deny CONNECT !SSL_ports

http_access allow localhost manager

http_access allow localnet

http_access deny all

icp_access allow localnet

icp_access allow localhost

icp_access deny all

# NETWORK OPTIONS

# -----------------------------------------------------------------------------

http_port 3128

# MEMORY CACHE OPTIONS

# -----------------------------------------------------------------------------

cache_mem 256 MB

maximum_object_size_in_memory 2048 KB

memory_replacement_policy lru

# DISK CACHE OPTIONS

# -----------------------------------------------------------------------------

cache_replacement_policy lru

cache_dir ufs /var/spool/squid3 2000 16 256

minimum_object_size 0 KB

maximum_object_size 40960 KB

# LOGFILE OPTIONS

# -----------------------------------------------------------------------------

access_log /var/log/squid3/access.log squid

cache_store_log /var/log/squid3/store.log

# OPTIONS FOR TUNING THE CACHE

# -----------------------------------------------------------------------------

refresh_pattern ^ftp: 1440 20% 10080

refresh_pattern ^gopher: 1440 0% 1440

refresh_pattern -i (/cgi-bin/|\?) 0 0% 0

refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880

refresh_pattern . 0 20% 4320

refresh_pattern -i .mpd$ 1440 100% 1440 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private

range_offset_limit -1

# ICP OPTIONS

# -----------------------------------------------------------------------------

icp_port 3130

# OPTIONS INFLUENCING REQUEST FORWARDING

# -----------------------------------------------------------------------------

prefer_direct off

cache_peer 192.168.2.112 sibling 3128 3130 proxy-only allow-miss

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