Re: Squid and local multicast network

srainey@rmplc.net writes:

>I have 7 Squid caches running under BSDI 2.10 and all on the same IP
>subnet. I wish to configure them as siblings and it seems reasonable to set
>up a local multicast network. However, after a couple of hours surfing the
>web I'm not much nearer being able to set this up.
>
>Multicast support is built into the kernel, but do I need to use mrouted if
>I'm not routing traffic beyond my local subnet? Can I choose any address
>from the 224.0.0.0/4 block given that I'm not routing this network, or is
>there a block for private multicast networks (is that what 224.0.0.0/24 is
>for)?

You don't need mrouted if all machines are on the same subnet. Since
mrouted is not running (and if mcast is not enabled in your routers)
you should be able to use any address at all.

>I've tried setting up rm-ps-squid-multicast.rmplc.co.uk to be 224.0.0.1 and
>then using this in squid.conf (on the host rooster) ...
>
>mcast_groups 224.0.0.1
>
>cache_host rm-ps-squid-multicast.rmplc.co.uk multicast 8080 3130 ttl=64
>cache_host adder.rmplc.co.uk sibling 8080 3130 multicast-responder
>cache_host rattle.rmplc.co.uk sibling 8080 3130 multicast-responder
>cache_host barracuda.rmplc.co.uk sibling 8080 3130 multicast-responder
>cache_host elk.rmplc.co.uk sibling 8080 3130 multicast-responder
>cache_host whale.rmplc.co.uk sibling 8080 3130 multicast-responder
>cache_host eagle.rmplc.co.uk sibling 8080 3130 multicast-responder

Hm, there might be something special about 224.0.0/24, but I'm not sure.

Feel free to use local.mcast.ircache.net (224.0.14.33) if you can
guarantee that your packets won't leave your net/org.

>I've also added a route ....
>
>route add -net 224.0.0.0 -netmask 240.0.0.0 -interface 194.238.50.8
>
>where 194.238.50.8 is the IP address of the single ethernet port in the
>server.
>
>I've also tried using 224.0.0.2 with no luck.
>
>If I ping 224.0.0.1 I get responses from all the other hosts, but Squid
>just doesn't seem to be responding to multicast requests.

tcpdump?

Duane W.
Received on Thu Aug 28 1997 - 12:31:48 MDT