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Old 02-20-2008, 06:07 AM   #1
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Registered: Feb 2008
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problem to add virtual interface on fedora 8


I have looked for this in very many forums but I didn't find something.

I have a problem to add virtual interface on fedora 8.
I've done installation of fedora 8 as server.
I have ip from dhcp server and after NAT.
So my ip address is
Subnet mask and default gateway is
I need to create two virtual interfaces eth0:1 and eth0:2.
I have done the following things:

ifconfig eth0:1 netmask up
ifconfig eth0:2 netmask up

After " ifconfig -a "

I saw that I have new interfaces but when I'll try to add them to the kernel IP routing table I have some strange problem.

route add -net netmask

Error : SIOCADDRT invalid argument

So I'd like to see after "route"
that I have in column Iface eth0:1 and etho:2
now I see only eth0.

Thank you very much for help.
Old 02-20-2008, 06:34 AM   #2
Simon Bridge
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Registered: Oct 2003
Location: Waiheke NZ
Distribution: Ubuntu
Posts: 9,211

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You have successfully added the virtual interfaces, you are having trouble adding the network to the routing table.
Possibly missing out some of these steps caused some confusion.

route command error messages[pdf]

Error : SIOCADDRT invalid argument
SIOCADDRT is an error message ADDing a RouTe.
"invalid argument" normally comes from missing something out. The line:
route add -net netmask
looks fine though. Is there anything else to the error message?


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