Loosing alias IPs

[Tom Judge]

Buki wrote:
> On Mon, Aug 20, 2007 at 10:34:49AM -0700, Doug Barton wrote:
>> FYI, this isn't really a question for -isp, freebsd-questions at freebsd.org 
>> would have been a better choice.
>>
>> On Sun, 19 Aug 2007, Pavlos Georgiadis wrote:
>>
>>> Hello,
>>>
>>> I have a FreeBSD 6.2 server that get's his IP address from DHCP
>>> (although this IP is static). I have also configured 3 more alias IP
>>> addresses.
>>>
>>> My problem is that anytime the DHCP lease is renewed (with the same IP
>>> address always), one of the 3 aliases is lost.
>>>
>>> Is this a bug? Or am I doing something wrong?
>>>
>>> My setup is as follows:
>>>
>>> the IP address that the server gets by DHCP is X.X.139.45
>>>
>>> rc.conf
>>> ifconfig_em0="DHCP"
>>> ifconfig_em0_alias0="inet X.X.141.113 netmask 0xfffff000"
>>> ifconfig_em0_alias1="inet X.X.142.124 netmask 0xfffff000"
>>> ifconfig_em0_alias2="inet X.X.142.128 netmask 0xfffff000"
>> You probably want to do this either in dhclient.conf or in a 
>> dhclient-exit-hooks script. Check the man pages to get an idea of how to 
>> go about this, and ask on -questions if you need more help.
> 
> Also, aliased Ip addresses must be configured with netmask /32
> 

This is only true if the IP aliases are in the same network as the first 
IP address. The following would be a valid configuration:

ifconfig_em0="inet 192.168.0.1/24"
ifconfig_em0_alias0="inet 192.168.0.2/32"
ifconfig_em0_alias1="inet 192.168.1.1/24"
ifconfig_em0_alias2="inet 192.168.1.2/32"


Tom
>> Good luck,
>>
>> Doug
>>
>> -- 
>>
>>     This .signature sanitized for your protection
> 
> Buki