How do I configure Squid to receive and respond to Multicast ICP?
You must tell Squid to join a multicast group address with the mcast_groups directive. For example: mcast_groups 224.9.9.9 Of course, all members of your Multicast ICP group will need to use the exact same multicast group address. NOTE: Choose a multicast group address with care! If two organizations happen to choose the same multicast address, then they may find that their groups “overlap” at some point. This will be especially true if one of the querying caches uses a large TTL value. There are two ways to reduce the risk of group overlap: • Use a unique group address • Limit the scope of multicast messages with TTLs or administrative scoping. Using a unique address is a good idea, but not without some potential problems. If you choose an address randomly, how do you know that someone else will not also randomly choose the same address? NLANR has been assigned a block of multicast addresses by the IANA for use in situations such as this. If you would like to be assigned one of thes
