Date: Wed, 20 Apr 2016 08:18:12 -0600 From: alan somers <asomers@gmail.com> To: Julian Elischer <julian@freebsd.org> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: Assigning same ip address to different interfaces with different FIBs Message-ID: <CAOtMX2hMGnPQ7UNrPnmuB%2B18jV78i495EWeaXgTpFnzhGPy7ww@mail.gmail.com> In-Reply-To: <571757A8.8030007@freebsd.org> References: <118390227.3958522.1461146303528.JavaMail.yahoo.ref@mail.yahoo.com> <118390227.3958522.1461146303528.JavaMail.yahoo@mail.yahoo.com> <571757A8.8030007@freebsd.org>
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What you described doesn't work in FreeBSD, and there's even an open bug for it. But as Julian described, you should see if VIMAGE will work for you. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=189088 -Alan On Wed, Apr 20, 2016 at 4:19 AM, Julian Elischer <julian@freebsd.org> wrote: > On 20/04/2016 5:58 PM, M. V. via freebsd-net wrote: > >> Hello guys, >> I have a problem with having multiple FIBs in FreeBSD-9.2. I've already >> setup 4 FIBs in kernel, and everything is OK. I assigned each interface to >> one FIB and I can add routes to any of FIBs I want, and everything works >> fine.But my problem is, I want to assign same IP address to multiple >> interfaces. for example: >> interface em1 (in FIB-1) : 100.100.100.1/24interface em2 (in FIB-2) : >> 100.100.100.1/24 >> this should work, bacause I want each FIB's interfaces and routes to be >> completely separate from other FIBs' interfaces and routes. for this I do:# >> sysctl net.add_addr_allfibs = 0 >> > I think you are using the wrong tool to do this job. > Fibs will "kind-of" allow you to do some of this but all fibs still 'see' > all interfaces, Even if you don't set routes to them. > What you want is VIMAGE/VNET > Even though we've made vnet a characteristic of a jail (it wasn't always), > you can still use it in the way you want if done right. > Write a "how-to" when you've got it worked out :-) > > > # ifconfig em1 fib 1# ifconfig em2 fib 2# setfib 1 ifconfig em1 >> 100.100.100.1/24# setfib 2 ifconfig em2 100.100.100.1/24 >> but this doesn't work as expected, and 100.100.100.0/24 route is only >> being added to FIB-1 (second IP assignment command doesn't work, though it >> returns no error).# setfib 1 netstat -rn ==> this fib has >> 100.100.100.0/24 entry added in it# setfib 2 netstat -rn ==> nothing is >> added here. >> > > there are some sysctls that control some of this. have you investigated > them? > > Though, as I say, you really want to structure your problem around using > vimage. Each vimage instance can have identical interfaces etc, becasue > they are effectively separate machines. You can route between them > internally to the machine and at one stage you could have a process with > sockets on each net but I"m not sure if you can still do that easily. > > > > >> Is there any way I can do this in FreeBSD? >> Thank you. >> _____________________________________________ >> >
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