I've done this sort of thing before, but never with one interface
running dhcp. You definitely want to emerge iproute2 (which gives you
the ip command), and add your interfaces to /etc/iproute2/rt_tables, for
example (though in this case, 10 eth0 won't actually get used):
10 eth0
11 eth1
12 eth2
Then in /etc/conf.d/net, put:
modules_eth0=("iproute2")
modules_eth1=("iproute2")
modules_eth2=("iproute2")
config_eth0=("dhcp")
config_eth1=("10.0.0.{1-10} netmask 255.255.255.0 broadcast 10.0.0.255")
rules_eth1=("from 10.0.0.0/24 src table eth1")
routes_eth1=("10.0.0.0/24 src 10.0.0.1 table eth1"
"10.0.0.0/24 src 10.0.0.2 table eth1"
*** and so on ***)
Then do the same kind of thing for eth1. Now, I also seem to remember
that I had another system that I just did everything with the ip
commands in rc.local. And since you're also using dhcp, I don't know if
that will muck with the routing tables everytime the IP renews itself.
Hope that helps. (Also, I seem to remember finding a decent amount of
information about multihoming with iproute2 on the gentoo forums)
-Sean
BRM wrote:
Ok, first - I wasn't sure which list this should go to, so if this is
the wrong list please just let me know.
I am in the process of upgrading my server from a P90 running Slackware
to a "newer" system running Gentoo 2007.0. Everything is pretty okay
until I got to doing the network config. My basic config is as follows:
Public DHCP'd Interface -> eth0 (default gw)
Private Lan Interface #1 -> eth1
Private Lan Interface #2 -> eth2
I also have a number of IP Aliases on the eth1 & eth2. I managed this
under Slack through a series of custom rc scripts, which autodetected
the IP address of eth0 for use in the routing. However, I am having
trouble figuring out how to do the same thing in Gentoo's conf.d/net
file system.
Thus far, in /etc/conf.d/net, I have the following:
config_eth0("dhcp")
config_eth1(<list of static IP addresses>)
config_eth2(<static ip address>)
I also had a route line for eth1 and eth2, but it specified the IP of
eth1, not eth0 - which is unknown.
I've tried the following:
route_eth1("default via ${COMMAND_STRING_TO_EXTRACT_IP_OF_ETH1}")
which kinda works (it does get the IP address, but fails with at adding
the route - I'm not at the system right now, so I'll have to post the
specific SIG name later); however, I am very much doubting that that is
the right way to do what I want under Gentoo.
So, my primary question is:
What is the proper way to do this under Gentoo?
I know I could just go and manually write versions of
/etc/init.d/net.eth1/eth2, but I'd rather do it the right way if there
is one, and only do that as a last resort. (And even then, wouldn't I
be risking the Gentoo Configuration system replace them with symlinks?)
Any how...any advice on the proper way to do this would be greatly
appreciated. I really like Gentoo and really do want to keep - I use to
keep Slack up-to-date manually, and just don't have the time for it
anymore, which is why I'm trying Gentoo.
Thanks,
Ben
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