[support] Re: MR not able to send BU, when move from HL to FL(ipv4 n/w)

[Maheshwar Singh]

Hi All
Please provide some feedback on the previous mail.  Adding some more
information, which can be helpful to knock down the issue, I am facing at my
end.

I Looked into the code and this is my observation related to the issue:

When we move from HL to ipv4 FL, this is the flow of MIP code:

*mn_movement_event()* ---> *mn_chk_ho_verdict()* --->
*mn_make_ho_verdict()*---->
*md_get_first_router()*

The last routine is returning NULL as there is no entry of default router in
the list. And if it is NULL, then the routine *mn_home_rtr_chk()* is not
called. And the flag (*at_home* in *home_addr_info* struct) is not set as
0.  Flags previous value is 1, which means that we are in HL. So the
routine *mn_move()* is not called. This is the reason movement detection is
failing, when we move from HL to IPv4 network.

In case, when we move from HL to IPv6 network, that time the routine *
md_add_default_router()* is called, which add the entry for default router
in list. This process is triggered, when we receive the router advertisement
from the radvd running in IPv6 only foreign network.

My doubt is, do we need some routing advertisement daemon for IPv4 traffic
on IPv4 only FL, or need to do changes in code. Please provide some
pointer..........

- Maheshwar Singh
On Mon, Dec 29, 2008 at 5:17 PM, Maheshwar Singh <
singh.maheshwar72 at gmail.com> wrote:

>   Hi All
>
> I am new to this group and facing some issues, while moving MR from home
> link to foreign link(ipv4 network). The MR is not sending BU to HA. When
> seen in the mip6d logs, the movement detection code is not getting
> triggered. But when I start the mip6d daemon( in MR) in FL(ipv4 network),
> then MR sends the BU to HA. Attaching the mip6d logs for MR in both
> scenario.
>
> a. In the logs, we see the below error messages.
>                mip6d[4330]: Interface 7 (sit0):type 776 unsupported
>                mip6d[4330]: Interface 9 (tunl0):type 768 unsupported
>                mip6d[4330]: Interface 15 (sit1):type 776 unsupported
>                mip6d[4330]: Interface 16 (tunl1):type 768 unsupported
>
>     Do we need some specific patch to fix the above error message. Till now
> I have applied the following
>     patches.
>               1. NEPL basic patch
>               2. umip-dsmip-20080530.tar
>               3. umip-dsmip-v4traffic-20081021.tar
>
>      The linux kernel used is linux-2.6.24. Please provide some pointer to
> proceed further.
>
> Regards
> Maheshwar
>
>
>
>
>
>
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