[quagga-users 11309] Re: very newbish question regarding netwok discovery

Peter J. Holzer hjp+quagga at wsr.ac.at
Mon Jan 11 10:48:49 GMT 2010


On 2010-01-10 17:26:14 -0500, Christopher Barry wrote:
> Can anyone speak to the behavior of OSPF as a potential discovery
> protocol for the above scenario?

To speak OSPF you need an IP address, but you should be able to listen
to it without:

# tcpdump -e -vv -n proto ospf
11:41:14.360321 00:13:72:3b:e3:8e > 01:00:5e:00:00:05, ethertype IPv4 (0x0800), length 78: (tos 0xc0, ttl   1, id 59875, offset 0, flags [none], proto: OSPF (89), length: 64) 143.130.50.15 > 224.0.0.5: OSPFv2, Hello, length: 44
        Router-ID: 143.130.18.3, Area 0.0.0.1, Authentication Type: none (0)
        Options: [External]
          Hello Timer: 10s, Dead Timer 40s, Mask: 255.255.240.0, Priority: 1
          Designated Router 143.130.50.15

So here you have a router 143.130.50.15/255.255.240.0, which means the
network is 143.130.48.0/20.

I'm not sure whether all hosts can receive all multicasts, though. You
may have to do something special to receive them.

        hp


-- 
   _  | Peter J. Holzer    | Auf jedem Computer sollte der Satz Ludwigs II
|_|_) | Sysadmin WSR       | eingeprägt stehen: "Ein ewig Rätsel will ich
| |   | hjp at wsr.ac.at      | bleiben, mir und andern."
__/   | http://www.hjp.at/ |    -- Wolfram Heinrich in desd
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