Date: Sat, 18 Feb 2012 11:39:27 +0100 From: Damien Fleuriot <ml@my.gd> To: Andrew Boyer <aboyer@averesystems.com> 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: <4F3F7FDF.8060202@my.gd> In-Reply-To: <37B92AD6-F745-4D26-A924-271476558D93@averesystems.com> References: <1329376106.7683.YahooMailNeo@web162203.mail.bf1.yahoo.com> <4F3D0197.60100@my.gd> <37B92AD6-F745-4D26-A924-271476558D93@averesystems.com>
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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 ?
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