On Jan 3,  5:57pm, Stanislaw Szczygiel wrote:
}
} O.K, again about problems with ifaliases. This time with more
} informations about system and initialization files.  Problem is in
} lack of any result of working ifaliases:  they appear the same as in
} 1.3.2 (and then work very well), but in 1.3.3 - I see the effect of
} commands (see below) - the same as in working 1.3.2 NetBSD!!!  But
} ping on address 148.....161, 162, 164 - gives no echo.  But there is a
} little change between old system and new:  now I use 100MB SMC PCI
} cards, erlier there were 10MB netcards...  System works fine, speed is
} very well - so I think systemm see my cards well. But maybe there are
} some changes in drivers... I really dont know why this not work.
} 
} Ok, lets see my parameters and effect of netstat.
} 
} This is "ifaliases" file:
} 
} 148.81.82.161 ep2 255.255.255.255
} 148.81.82.162 ep2 255.255.255.255
} 148.81.82.164 ep2 255.255.255.255

     On my system, I don't bother with netmasks in ifaliases.  Try:

148.81.82.161 ep2
...

The other thing you could try is what somebody else suggested, which
is to make the netmask the same as the primary one for the interface,
i.e.:

148.81.82.161 ep2 255.255.255.0
...

}-- End of excerpt from Stanislaw Szczygiel