Hijacking this thread, cuZ now I am worried . . . .
On Mon, Nov 28, 2005 at 11:46:56PM -0800, David Ulevitch wrote:
I'd like to hear how people are using OpenOSPFd
I will prbly use OpenOSPFd in the future, but at the moment, my
question
is about using OpenBGPd and multiple lines from the same provider.
I am getting 4 T1s from a single provider. Issues with local telco
"facilities" for T3's and other things are causing me problems with
getting anything different.
I am going to end up with something like this:
san0-\
san1-\\ all connected to a single provider
san2-//
san3-/
Now, I assume I will have a single BGP session with them. (I have
very
little information for lines that are supposed to be installed
tomorrow
morning at 9am).
Right now I have a cisco 3640 that has 2 T1's from AT&T and 2 from
Sprint, it has enough trouble with those which is why I want to
replace
it with an OpenBSD box. I am going to have an iBGP session with the
3640 and an eBGP session with my new provider.
I will be adding 20Mb over ethernet at some point in the fairly
near future
(if they can ever get it installed) and will hopefully be getting
rid of
the 3640 at that point.
The OpenBSD router will not be doing any NAT, it will be passing
public IPs.
This is what has me worried:
On Tue, Nov 29, 2005 at 03:33:07PM +0100, Claudio Jeker wrote:
There is no kernel support for multipath routing.
I want to load balancing across those 4 T1s and it is sounding
like I
will not be able to do that and will have to figure out how to get
these
4 new lines into my old cisco router.
Unfortunately trunk(4) doesn't work with san interfaces :-( and
that is
how it looked possible to do the bonding/inverse muxing that I was
going
for.
$ ifconfig trunk0 trunkport san0 trunkport san1
ifconfig: SIOCSTRUNKPORT: Protocol not supported
It would be really kewl to use the trunk(4) interface for the BGP
peer address, since it now does failover, it would be up as long as
any
individual lines were up. It would be even kewler if it would be
able
to change the weighting on that interface depending on the number of
lines in the trunk, but I guess I am dreaming again.
I guess I am looking for something like 'ip load-sharing per-
packet' in
cisco terms. But my real question is: How do I get OpenBSD to
treat
those 4 T1s as a single line and share the load across them?
or, how do I get a reasonable approximation from OpenBSD?
Also, with those 4 T1s, I want to make sure that in case any of the
4 go down,
the BGP session will stay up. With a cisco box, I just bind the
session
to a loopback address, add routes for each interface and it will
choose
one of the interfaces that is up to get to the destination. How do
I do
this with OpenBSD?
Will the BGP session just work when I solve the load balancing
issue?
or do I have to do weird things with ifstated(8) (like 16 states
for the
4 lines and lots of route add/delete statements)?
or something with 'route-to' in pf?
http://marc.theaimsgroup.com/?l=openbsd-misc&m=112831360613745&w=2
This seems to work in my test environment:
# t1s is an interface group containing all of the links to that
provider
pass out on t1s route-to { \
(san0 10.35.0.2) \
(san1 10.35.1.2) \
(san2 10.35.2.2) \
(san3 10.35.3.2) \
} round-robin keep state
pass in on san0 reply-to (san0 10.35.0.2) keep state
pass in on san1 reply-to (san1 10.35.1.2) keep state
pass in on san2 reply-to (san2 10.35.2.2) keep state
pass in on san3 reply-to (san3 10.35.3.2) keep state
l8rZ,
--
andrew - ICQ# 253198 - JID: [EMAIL PROTECTED]
Proud member: http://www.mad-techies.org
BOFH excuse of the day: telnet: Unable to connect to remote host:
Connection refused
