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xen-users
Re: [Xen-users] Xen with 'Routing' scripts
Am Montag, den 18.04.2005, 16:30 +0200 schrieb Roland Paterson-Jones:
> Now really, the only ugly part is discovering/forcing the dom-U IP
> addresses.
If you do not want to patch dhcpd, you may do funny other things:
* generate huge dhcpd.conf with bash/perl scripts (ok, that's not so
funny)
* supply all domUs with a network initscript which greps network
information from kernel command line /proc/cmdline (for example
"eth0=192.168.1.2/24 gw=192.168.1.1". Put not only mac address
into /etc/xen/domUconf, but also 'extra+=" eth0=..."'
* poor man's dhcp: encode all networking information (ip/mask/gw) within
the MAC (for networks <= /21 possible) and supply all domUs with
a network initscript that decodes the MAC. For example 192.168.1.2/24
with gw 192.168.1.1 could be encoded as
0x80:1:192:168:1:2
(decimal octets have to be converted to hex): the first four bits are
the prefix-complemneent "32-24=8", the next tree bits are void, the
eighth bit has to be zero (to be a valid unicast MAC), the second MAC-
octet is the last IP-octet of the gw-ip (.1), the last four MAC-octets
are the ip.
Evil, eh?
/nils.
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