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: >> >> On Feb 16, 2012, at 8:16 AM, Damien Fleuriot wrote: >> >>> On 2/16/12 8:08 AM, M. V. wrote: >>>> hi everybody, >>>> >>>> i have a problem with setting multiple IPs in the same network in FreeBSD: >>>> >>>> - 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 >>>> >>>> - 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 >>>> ... >>>> >>>> - 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 >>>> >>>> #netstat -r >>>> .... >>>> >>>> 192.168.10.2 lo0 >>>> ..... >>>> >>>> - 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)? >>>> >>>> Thanks. >>>> >>> >>> You shouldn't assign your secondary IP with a /24 mask, use /32. >>> >>> You'll run into problems otherwise. >>> >>> As a rule of thumb, your aliases = /32 >>> >> >> 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? >> >> -Andrew >> > > This is of interest to me. > > Do these fixes allow one to use say /24 aliases instead of /32 without > running into problems ? > 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.comhelp
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