[ofa-general] ipoib connected mode

[Or Gerlitz]

Michael Di Domenico wrote:
> 5. On RedHat EL 4 up4, the IPOIB implementation is not spec-compliant:
>    - ipoib multicast does not work
>    - ipoib cannot interoperate between RHEL4U4 and other hosts. This is due to
>      missing code in the kernel which was available in U3 and U5 but removed in
>      U4. As a workaround, upgrade to RHEL4U5.
>
> I found this blurb in the ipoib_release_notes file inside
> ofed-1.2.5.1.  Does this mean that IPoIB does not work between a
> RHEL4U4 and RHEL5 x86_64 machine?  I ask, because i have one of each
> one with Ipath and one with Mthca and i can certainly talk between the
> machines.
>   
RH4 U4 kernel has a bug which causes all IP multicast traffic routed to 
ipoib interfaces to be going over the broadcast group, this does not 
prevent unicast interoperability between U4 to other systems, but, if 
you have any IP multicast going in your app/system, I would suggest move 
a way from U4 (eg to U5 or RH5, etc), see 
https://bugs.openfabrics.org/show_bug.cgi?id=266 for more details.

> Is connected mode supported?
>   
yes