Re: Gigabit Linux Routers

[Ingo Flaschberger <if () xip at>]

Dear Joe,

> Several different traffic shaping strategies are available, and I think
> all of them go far beyond "simple".

ipfw 100 add pipe 1 all from 192.168.0.0/24 to any xmit vlan1
ipfw pipe 1 config bw 95Mbit/s queue 200Kbytes

thats simple.

> > cons: only 1 route for each network, vrrp failover is not easy to
> >         implement with quagga and ospf, no multipath routing
>
> carp seems easy to implement, even with quagga and ospf.  At least, it's
> set up on a lab setup here and everything appears to work as expected.

example setup:

A----(ospf)---B
\            /
 \          /
  \        /
   \      /
    \    /
     lan1

A and B share 1 virtual ip for lan1 (192.168.0.1/24).
problems:
*) only 1 ip-net supported (no aliases)
*) carp is i bound, carp-dev line openbsd is in development
        (not shure if already stable)
*) if carp switch over:
        t=0: A is master, has route 192.168.0.1/24
             B has route 192.168.0.1/24 via ospf
        t=1: A goes down, route disappear (need linkstate in ospf)
        t=2: B carp takes over 192.168.0.1/24
                B can not add 192.168.0.1/24 route as it is still
                known via ospf
        t=3: B gets update to remove route 192.168.0.1/24 via ospf
        t=4: 192.168.0.1/24 route has disappeared, failover broken.

with ucarp, some special scripts and source code changed I was able
to handle this situation, but not with carp and ospf (at least at
freebsd 6.3)

Kind regards,
        Ingo Flaschberger