[zeromq-dev] Precise meaning of ZMQ_MULTICAST_HOPS?

Steven McCoy steven.mccoy at miru.hk
Sat Sep 1 15:34:30 CEST 2012


On 1 September 2012 07:01, Cem Karan <cfkaran2 at gmail.com> wrote:

> > 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?
>

A hop is a specific network term for traversing a router, devices such as
network bridges run at level 2 (data-link layer) thus cannot change the TTL.

http://en.wikipedia.org/wiki/Hop_(networking)

Cisco routers offer a lot of flexibility and you can override this, you can
even propagate broadcast across networks.

-- 
Steve-o
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