Date: Fri, 16 Mar 2012 16:50:29 -0400 From: Andrew Boyer <aboyer@averesystems.com> To: Damien Fleuriot <ml@my.gd> Cc: freebsd-net@freebsd.org, "M. V." <bored_to_death85@yahoo.com> Subject: Re: Assigning multiple IPs in the same network to an interface Message-ID: <3672F21A-B65A-4F55-8D02-D2C5FFFACE3D@averesystems.com> In-Reply-To: <4F3F7FDF.8060202@my.gd> References: <1329376106.7683.YahooMailNeo@web162203.mail.bf1.yahoo.com> <4F3D0197.60100@my.gd> <37B92AD6-F745-4D26-A924-271476558D93@averesystems.com> <4F3F7FDF.8060202@my.gd>
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On Feb 18, 2012, at 5:39 AM, Damien Fleuriot wrote: > On 2/16/12 3:39 PM, Andrew Boyer wrote: >>=20 >> On Feb 16, 2012, at 8:16 AM, Damien Fleuriot wrote: >>=20 >>> On 2/16/12 8:08 AM, M. V. wrote: >>>> hi everybody, >>>>=20 >>>> i have a problem with setting multiple IPs in the same network in = FreeBSD: >>>>=20 >>>> - suppose I assign two new IP addresses in the same network to eth0 = with ifconfig: >>>> #ifconfig eth0 add 192.168.10.1/24 >>>> #ifconfig eth0 add 192.168.10.2/24 >>>>=20 >>>> - everything works fine and the output of "netstat -r" is like what = it should be: >>>> #netstat -r >>>> .... >>>> 192.168.10.0 eth0 >>>> 192.168.10.1 lo0 >>>> 192.168.10.2 lo0 >>>> ... >>>>=20 >>>> - but now if I delete first IP address, connection to 192.168.10.0 = network will be gone. and in output of "netstat -r" the route to = 192.168.10.0 (via eth0) is gone: >>>> #ifconfig eth0 delete 192.168.10.1 >>>>=20 >>>> #netstat -r >>>> .... >>>>=20 >>>> 192.168.10.2 lo0 >>>> ..... >>>>=20 >>>> - am i missing something here? shouldn't the route to the network = remain in routing table (because we still have 192.168.10.2 assigned to = interface)? >>>>=20 >>>> Thanks. >>>>=20 >>>=20 >>> You shouldn't assign your secondary IP with a /24 mask, use /32. >>>=20 >>> You'll run into problems otherwise. >>>=20 >>> As a rule of thumb, your aliases =3D /32 >>>=20 >>=20 >> M.V. - >> What you are doing should work fine. There were a handful of routing = table bugs fixed in the last few months that corrected this behavior. = The last two were just merged to stable/8 yesterday. What release are = you running? =20 >>=20 >> -Andrew >>=20 >=20 > This is of interest to me. >=20 > Do these fixes allow one to use say /24 aliases instead of /32 without > running into problems ? >=20 Sorry for the long delay. I'm not aware of any restriction on how many = IPs or subnets you can install, as long as the subnets don't conflict. I haven't tried IPv6, though... -Andrew -------------------------------------------------- Andrew Boyer aboyer@averesystems.com
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