FreeBSD & FIBs (setfib) - How to modify?
nvass9573 at gmx.com
Thu Jul 16 17:47:31 UTC 2009
Brent Bloxam wrote:
> Nikos Vassiliadis wrote:
>> Brent Bloxam wrote:
>>> The documentation on FIBs is pretty slim unless I've been looking in the
>>> wrong places, all I've seen are a few mentions in errata and release
>>> notes. setfib(1) doesn't offer much in the way of associated commands,
>>> and definitely doesn't explain how to actually work with a FIB. I'm
>>> curious if there's a command to specifically modify a FIB beyond 0,
>>> besides something like
>>> setfib 1 route add ...
>> setfib selects the routing table for locally originated
>> outgoing packets. Besides locally originated packets, there
>> are packets arriving from the network and need to be forwarded.
>> These packets can be classified in a specific routing table
>> with the aid of ipfw. That's all there is. I can't think
>> of something else that needs to be thought with regard to
>> multiple routing tables.
>> HTH, Nikos
> Sorry, perhaps I wasn't clear. What I'm interested in is if there's a
> way to deal with *modifying* those other routing tables, besides using
> setfib as I described (e.g., you want to have a different default
> gateway). There would be no reason to have multiple routing tables if
> they're carbon copies of one another.
setfib has no internal commands. setfib runs the command you tell it
to in a specific routing table. You modify/inspect the routing tables
with the standard tools, that is route, netstat, some dynamic routing
daemon(quagga, etc) and in general everything that's related to the
Just start a shell in FIB 10 and every command forked from
that shell will be bound to FIB 10.
setfib 10 csh
... do some work
you're back in FIB 0.
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