Re: nslu2: two devices: one by default
En/na Michael Shuler ha escrit:
On 11/09/2009 11:23 AM, Xan wrote:
En/na Lennart Sorensen ha escrit:
'ethtool' or 'ip link' should be able to tell you if a link is up or
A clever tool would subscribe to netlink and get notifications of link
state changes, but that probably isn't necesary.
I'm planned to write a daemon which change route table according with
the ip link state of eth0. I have two alternatives: use ip link and see
periodically the state of link of eth0 and use netlink. I think the best
it's the second (in the first case I have to wait one hour or one
minute.... for recover eth0 connection after plug).
Can you help me writting it?
In the man page of netlink, we could follow:
The following example creates a NETLINK_ROUTE netlink socket which will
listen to the RTMGRP_LINK (network interface create/delete/up/down
events) and RTMGRP_IPV4_IFADDR (IPv4 addresses add/delete events) mul‐
struct sockaddr_nl sa;
memset(&sa, 0, sizeof(sa));
snl.nl_family = AF_NETLINK;
snl.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR;
fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
bind(fd, (struct sockaddr*)&sa, sizeof(sa));
Is this that we want? Sorry but I'm not clear with this documentation.
I simply want script that:
- get notification via netlink of up/down changes of eth0
ip route del default via 10.200.16.1 dev eth0
ip route del 10.200.64.0/20 dev eth0 proto kernel scope link src
if eth0 link is down
ip route add 10.200.64.0/20 dev eth0 proto kernel scope link src
ip route add default via 10.200.16.1 dev eth0
if it's come back.
I have not looked into the details of the issues you are having, and
have not actually used whereami scripts - but the whereami package
description looks to be very close to what you are looking for, and also
would seem to be the natural place to contribute features/functionality
to do what you want, if it does not already. Just an observation. :)
Mmm... interesting.... I will see that.
Thanks a lot for that suggestion, although I think I need some help
writting that. I'm just desktop user with _minimal_ c++ skills.