[zeromq-dev] Precise meaning of ZMQ_MULTICAST_HOPS?

Cem Karan cfkaran2 at gmail.com
Sat Sep 1 13:01:38 CEST 2012


On Aug 31, 2012, at 7:26 PM, Steven McCoy wrote:

>> On 31 August 2012 16:59, CFK <cfkaran2 at gmail.com> wrote:
>>  it says that this limits the TTL, which would limit packets to whatever hop diameter I want, but the full documentation talks about 'local network', which makes me think of local subnet, which is an entirely different thing.  So, is it a true TTL, or is it for the local subnet?  If it is for the local subnet, what is the best/easiest way to make all multicast packets have a true TTL?
> 
> 
> A TTL of 1 is the local subnet, a value of 16 is quite popular as it bypasses a defect with some Cisco hardware.  Note you really need a very expensive router for good performance.

OK, so it will get routed around everywhere where the netmask is the same, right?  Not just 1 hop away?

Thanks,
Cem Karan
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