[ofa-general] Re: ARP in IPoIB

[Michael S. Tsirkin]

> Quoting Amar Mudrankit <amar.mudrankit at gmail.com>:
> Subject: ARP in IPoIB
> 
> Hello all,
> 
>     Being new to this group, following questions may sound a bit basic level
> but I would be really very happy if somebody could help me out in those.
> 
> 1] Does current implementation of IPoIB supports IP hosts spanning different IB
> subnets? If so, how does it resolves the IP addresses(QPN+GID etc) because how
> would the broadcast IP ( multicast IB) request would reach different IB subnet
> as the router should have multicast routing capabilities? Does it mean that the
> current IPoIB implementation is supported for hosts within single IB subnet and
> not beyond that?
> 
> 2] What is all-router multicast group(RFC-4391 section 10)? How does it help in
> routing packet to a IP host present on different IB-subnet?

Pls refer to this document: RFC 4393, IP over InfiniBand (IPoIB) Architecture
Chapter 3.3. IP Subnets Across IB Subnets which has some answers to your questions.

Here's a link:
http://tools.ietf.org/html/rfc4392

-- 
MST