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coolvibe
n00b
Joined: 02 May 2003
Posts: 7
Location: The Netherlands
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 Posted: Tue Dec 23, 2003 3:46 am Post subject: Gentoo, static ipv6 adresses and default ipv6 gateways |
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Hey folks,
Since I was setting up IPv6 in my home network, I was faced with the task of instrumenting my Gentoo box with the ability to grok static default routes. Why? Well, I could have relied on router advertising, but since that somehow entails messing with either radvd or dhcpv6, I hacked around a bit to supply that information myself. If you don't mind editing initscripts, this might be for you too.
I haven't got many machines at home, about 7 or so, all running something different (mostly BSD). If they all used those swanky mac-address based ipv6 adresses (or even worse, privacy extended and constantly changing adresses), it's a bitch to maintain a DNS server for them. What if you change a NIC in a machine? You'd have to change the DNS too... Yuck.
So I gave most of my machines static adresses.
In BSD it's easy to assign a machine a static IPv6 number and a default route through either /etc/hostname.* files or in the rc.conf. In Gentoo, I hacked up /etc/init.d/net.eth0 to include a new directive called 'gateway6'. The patch is included at the end (and I'll put it on the web somewhere).
First, let's demonstrate how my setup works:
I have one machine which is a ipv6 router. It has a ipv6 tunnel connection to somewhere, and has ipv6 packet forwarding on. That's very nice. All the other machines have static ipv6 numbers (I have a whole /64 to choose from, yay) and have their ipv6 default route set to the ipv6 router. So far so good. Simple to accomplish on most machines, except my Gentoo box.
Examine my /etc/conf.d/net:
| Code: |
# This looks familliar, no?
face_eth0="dhcp"
# Static IPv6 assignment (fingered to protect my box)
inet6_eth0="1234:5678:9012:345::67/64"
# The 'new' directive
gateway6="eth0/1234:5678:9012:345::1"
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When reloading your network, you might see something like this:
| Code: |
* Bringing eth0 up...
* Adding inet6 adresses...
* eth0 inet6 add 1234:5678:9012:345::67/64...
* Setting default ipv6 gateway...
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Voila! It works. Try ping6-ing out there somewhere.
Oh, lest I forget, the patch to /etc/init.d/net.eth0 (which is also available at my website:
| Code: |
--- net.eth0.dist 2003-12-23 02:59:43.861169696 +0100
+++ net.eth0 2003-12-23 03:07:09.366442600 +0100
@@ -121,7 +121,21 @@
/sbin/route del default dev ${gateway%/*} &>/dev/null
/sbin/route add default gw ${gateway#*/} dev ${gateway%/*} \
netmask 0.0.0.0 metric 1 >/dev/null || {
-
+ local error=$?
+ ifconfig ${IFACE} down &>/dev/null
+ eend ${error} "Failed to bring ${IFACE} up"
+ stop
+ return ${error}
+ }
+ eend 0
+ fi
+
+ if [ -n "${gateway6}" ] && [ "${gateway6%/*}" = "${IFACE}" ]
+ then
+ ebegin " Setting default ipv6 gateway"
+ # First delete any existing routes if it was setup by kernel ..
+ /sbin/route add -A inet6 default gw ${gateway6#*/} >/dev/null\
+ || {
local error=$?
ifconfig ${IFACE} down &>/dev/null
eend ${error} "Failed to bring ${IFACE} up"
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I hope this is of use to anyone. I know it's a bit of a hack, but it works for me.
Cheers,
Emiel
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