Hi,
after googling, rereading the manuals and lurking into the code I
really could
not find a way to do this, unless I am missing something really simple!
I have two BGP routers on a small subnet where they peer with a transit
provider, the two routers have a carp shared IP aswell, thus each of
them has
in there a $myip a $carpip and a $peerip
I wish that each of them when announcing the network I have in
configuration
as "network x.x.x.x/19" sends the announcement stating that $peerip
is the
nexthop, I am not using "depend" options on carp, what I want is that
the
traffic form the peer AS goes straight to the CARP IP (which
failovers in 50 ms,
much faster than anything BGP can ever do..).
I have tried:
- Having inside the "neighbor" configuration block a "set nexthop
$carpip",
but this seems to be plainly ignored
- Having an explicit "match to $peerip set nexthop $carpip", but that
seems
to affect only routes re-announched to the peer and not routes coming
from my "network a.b.c.d/19" option.
- Checking into the code, from what I see into mrt.c, function
mrt_dump_bgp_msg(), lines 123-124, the address placed into the BGP
message
is abruptly ((struct sockaddr_in *)&peer->sa_local)-
>sin_addr.s_addr) which
confirms why any option does not work.
I think that the possibility to announce an explicit nexthop to a
peer for
our AS's network(s) would be useful not only with this specific setup
but also
for all those who run BGP on an IP that is not the one of the
"router" that
has to receive the traffic.
I am more than willing to change the code myself but an hint would be
very
appreciated: am I missing something ? Is mrt_dump_bgp_msg() the right
place to
do it ? Hints on how to make it configurable (I would say an option
into the
peer or group configuration block).
Thank you for your attention and help.
A.
PS: I am off-list though I check it on the web, cc: would be
appreciated, thanks.
--------------------------
Andrea Cocito
[EMAIL PROTECTED]
IEO -- European Institute of Oncology
Department of Experimental Oncology
Fundamental Bioinformatics Research Unit - Director
Via Ripamonti 435
20141 Milano - Italy
tel: +39-02-57489857
fax: +39-02-57489851
IFOM -- FIRC Institute of Molecular Oncology
IT and Bioinformatics services - Coordinator
Via Adamello 16
20139 Milano - Italy
tel: +39-02-56816055
fax: +39-02-574303231
