Re: IP/IP and IPv6/IP tunnels and dynamic IP address
On Thu, Jun 27, 2013 at 01:16:44PM +0200, Urs Thuermann wrote:
> My ISP provides a single, dynamic IPv4 address to me. I have
> configured several tunnels, IPv4 in IPv4 and IPv6 in IPv4, to several
> sites. This is running on a very old Linux installation and I want to
> move that to a Debian system.
>
> I know how to set up /etc/network/interfaces for such tunnels if the
> IPv4 address is static. However, with dynamic IPv4 address you do not
> only needed ifup <tunnel> and ifdown <tunnel> but also a way to update
> the remote tunnel configuration when the local IPv4 address changes.
> E.g. for Hurricane Electric tunnel broker you access a certain URL
> (using e.g. wget) where the URL encodes your current IPv4 address. At
> another site I need to execute a command using ssh.
>
> I know how I can do that using cron and/or pppd configs. But I'd like
> to know if Debian has some standard way to update tunnel configs,
> preferrably in /etc/network/interfaces with the rest of the interface
> definition.
If the local address only changes on ifup/ifdown, then you can
add a preup or postup command to each interface that will run
an arbitrary command.
If the local address is controlled by a DHCP client, consult
your DHCP client's man pages for a script that can be run
post-change.
-dsr-
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