freebsd documentation

[Simon L. Nielsen]

On 2003.09.17 16:12:01 -0400, Adam Newhard wrote:

> For example, consider the case where the fxp0 interface is connected
> to two networks, the 10.1.1.0 network with a netmask of 255.255.255.0
> and the 202.0.75.16 network with a netmask of 255.255.255.240. We want
> the system to appear at 10.1.1.1 through 10.1.1.5 and at 202.0.75.17
> through 202.0.75.20.
> 
> The following entries configure the adapter correctly for this arrangement:
> 
>  ifconfig_fxp0="inet 10.1.1.1 netmask 255.255.255.0"
>  ifconfig_fxp0_alias0="inet 10.1.1.2 netmask 255.255.255.255"
>  ifconfig_fxp0_alias1="inet 10.1.1.3 netmask 255.255.255.255"
>  ifconfig_fxp0_alias2="inet 10.1.1.4 netmask 255.255.255.255"
>  ifconfig_fxp0_alias3="inet 10.1.1.5 netmask 255.255.255.255"
>  ifconfig_fxp0_alias4="inet 202.0.75.17 netmask 255.255.255.240"
>  ifconfig_fxp0_alias5="inet 202.0.75.18 netmask 255.255.255.255"
>  ifconfig_fxp0_alias6="inet 202.0.75.19 netmask 255.255.255.255"
>  ifconfig_fxp0_alias7="inet 202.0.75.20 netmask 255.255.255.255"**************************
>
> If you're configuring your system how you said above, those last 3
> lines needs a netmask of 255.255.255.240, not .255

No the current content is correct.  From the ifconfig(8) manual page:

     alias   Establish an additional network address for this interface.  This
             is sometimes useful when changing network numbers, and one wishes
             to accept packets addressed to the old interface.  If the address
             is on the same subnet as the first network address for this
             interface, a non-conflicting netmask must be given.  Usually
             0xffffffff is most appropriate.

0xffffffff is the same as 255.255.255.255.

-- 
Simon L. Nielsen
FreeBSD Documentation Team
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