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exeral
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Joined: 23 Jan 2013
Posts: 8

PostPosted: Wed Jun 12, 2013 2:57 pm    Post subject: persitent virtual interface Reply with quote

Hi everybody

I'm trying to setup a persistent virtual interface to add another private IP.

manually it works:
Code:
ifconfig eth0:0 192.168.10.10/24 up

"ip a" output the new ip adress on eth0

I edit /etc/conf.d/net to make it persistent:
Code:

config_eth0="my.pub.lic.ip/24 192.168.10.10/24"
routes_eth0=(
        "192.168.104.51/32 via aa.bb.cc.dd"
        "default gw xx.yy.yy.zz"
)


then I do : "/etc/init.d/net.eth0 restart"
some net dependend services restart but nothing about a new virtual interface happens.
"ip a" doesn't show anything about this virtual adress


on another server, It works with the same steps.
The difference is kernel version.
3.8.13 on working server
2.6.38.2 on non-working server

Is it related to kernel? do I have to take a look about a specific package ?

thanks
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Joined: 15 Oct 2012
Posts: 521

PostPosted: Wed Jun 12, 2013 3:07 pm    Post subject: Reply with quote

interface alias is not at all recomendable. Use tap or macvlan better. I think some of the problems where due to iptables not being able to work with interface alias. Nobody is using this anymore.
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exeral
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Joined: 23 Jan 2013
Posts: 8

PostPosted: Wed Jun 12, 2013 4:40 pm    Post subject: Reply with quote

It's still documented in handbook
http://www.gentoo.org/doc/en/handbook/handbook-amd64.xml?part=4&chap=2

I know as described:
Quote:
You cannot do anything special with these interfaces as the kernel and other programs will just treat eth0:1 and eth0:2 as eth0


but it doesn't matter for me. I'll not use iptables on this address
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Hu
Watchman
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Joined: 06 Mar 2007
Posts: 8597

PostPosted: Wed Jun 12, 2013 9:42 pm    Post subject: Reply with quote

Since you have the ip command installed, openrc will prefer that for configuring interfaces. The use of interface aliases is a workaround for limitations in ifconfig. The ip command can add extra addresses without the use of interface aliases.
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exeral
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Joined: 23 Jan 2013
Posts: 8

PostPosted: Thu Jun 13, 2013 9:11 am    Post subject: Reply with quote

I could add
Code:
/sbin/ip address add 192.168.10.10/24 dev eth0

to /etc/rc.local but i think it's not the best way
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massimo
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Joined: 22 Jun 2003
Posts: 1124
Location: Austria

PostPosted: Wed Jun 19, 2013 11:41 am    Post subject: Reply with quote

What routes are there after restarting eth0?
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PostPosted: Wed Jun 26, 2013 5:21 pm    Post subject: Reply with quote

Just a quick question an interface can use TWO addresses simultaneously with the ip command way??

thanks
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papahuhn
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Joined: 06 Sep 2004
Posts: 581

PostPosted: Wed Jun 26, 2013 6:47 pm    Post subject: Reply with quote

Yes.
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