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kashani
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Joined: 02 Sep 2002
Posts: 2032
Location: San Francisco
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 Posted: Thu Mar 06, 2003 2:04 am Post subject: binding /26 or so to an ether card... can I? |
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I seem to recall that once upon a time I did this, but if it was under Solaris or Unix I can not recall.
I'm doing a web server and some IP based vhosts. eth0 will be the main IP of the machine, 10.20.40.20/22.
I'd like to add 10.20.40.64-127 as eth0:0... or I could put them all on eth0, really doesn't matter. I suppose I could specify them all as aliases, but I was hoping for a one liner type thing to drop in the config or stick in rc.local.
Has anyone managed to pull this off under Gentoo?
kashani
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Chris W
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Joined: 25 Jun 2002
Posts: 972
Location: Brisbane, Australia
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| Posted: Thu Mar 06, 2003 2:41 am Post subject: |
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On Solaris you'd achieve this with:
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# ifconfig hme0:1 plumb
# ifconfig hme0:1 10.20.40.65 netmask 255.255.255.192 broadcast 10.20.40.63 up
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On Gentoo you have two options:
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# cat rc.local
ifconfig eth0:0 10.20.40.65 netmask 255.255.255.192 broadcast 10.20.40.63 up
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or you could add the new address, netmask, and broadcast address to /etc/conf.d/net in alias_eth0, netmask_eth0, and broadcast_eth0 respectively. The original address should still be set in iface_eth0. IMHO the second option is cleaner, keeps all the addresses in one place, and will have precisely the same result.
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"Common sense: The collection of prejudices acquired by age 18." -- Einstein |
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splooge
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Joined: 30 Aug 2002
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| Posted: Thu Mar 06, 2003 3:14 am Post subject: |
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It's already "built in" to gentoo... look in your /etc/conf.d/net file =) (Hint: it's the aliases option)
I do this to firewall all of our public IP's. Router plugs straight into a Gentoo box that houses all the external IP's (/27) and forwards 'em to selected boxes on the internal network. |
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kashani
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Joined: 02 Sep 2002
Posts: 2032
Location: San Francisco
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| Posted: Thu Mar 06, 2003 8:47 pm Post subject: |
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| splooge wrote: | It's already "built in" to gentoo... look in your /etc/conf.d/net file =) (Hint: it's the aliases option)
I do this to firewall all of our public IP's. Router plugs straight into a Gentoo box that houses all the external IP's (/27) and forwards 'em to selected boxes on the internal network. |
Finally found a reference and it appears to be a redhat thing.
/etc/sysconfig/network-scripts/ifcfg-eth0-range0
IPADDR_START=10.20.40.64
IPADDR_END=10.20.40.127
NETMASK=255.255.252.0
CLONENUM_START=0 # start with sub interface 0
It is documented in 'ifup-aliases' under Redhat. Hmmm maybe I'll play with it and see how hard it would be to do the same on Gentoo.
kashani
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thumper
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Joined: 06 Dec 2002
Posts: 554
Location: Venice FL
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| Posted: Mon May 05, 2003 10:34 pm Post subject: |
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| Quote: |
Finally found a reference and it appears to be a redhat thing.
/etc/sysconfig/network-scripts/ifcfg-eth0-range0
IPADDR_START=10.20.40.64
IPADDR_END=10.20.40.127
NETMASK=255.255.252.0
CLONENUM_START=0 # start with sub interface 0
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Before I dive in and rip up net.eth0 I was wondering if you got anywhere with it?
I've no desire to have 62 ip's on a line seperated by spaces if I could use a mask or defined ranges 
George |
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dice
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Joined: 21 Apr 2002
Posts: 577
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| Posted: Mon May 05, 2003 11:19 pm Post subject: |
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| Code: | echo -n "alias_eth0=\"" >> /etc/conf.d/net
for a in `seq 64 127`; do
echo -n "10.20.40.$a " >> /etc/conf.d/net;
done
echo "\"" >> /etc/conf.d/net |
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splooge
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Joined: 30 Aug 2002
Posts: 636
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| Posted: Tue May 06, 2003 1:20 am Post subject: Awesome =) |
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I misunderstood what Kashani wanted to do.
Good job there dice =)
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thumper
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Joined: 06 Dec 2002
Posts: 554
Location: Venice FL
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| Posted: Tue May 06, 2003 9:56 pm Post subject: |
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dice, that is nice typing saver, but still a lot of IP's to look through when reviewing the file, I was thinking of something like alias_eth0="192.168.0.193:61"
where the ip before the colon was the beginning ip, and the number after the colon was the number if ip's to count up from the base ip. In the above example the last ip would be 192.168.0.254.
Then more than one range could be specified having different counts and base ip's.
And now that I think about it, it could be expanded to handle the netmask and broadcast addresses such as alias_eth0="192.168.0.193:61:255.255.255.0:192.168.0.255".
This is the approach I have decided to take, and the /etc/conf.d/net will still be easy to read and /etc/init.d/net.eth0 will do the parsing.
George |
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