Re: Execute command upon interface initialization?
On 4/17/07, Ido Admon <[EMAIL PROTECTED]> wrote: Hello list, I couldn't find any way to execute an arbitrary command upon network interface initialization. My situations is that I have and ethernet card that takes DHCP from a cables provider (not a fixed IP address) and I need to update a DynDNS hostname everytime it does (everytime the IP changes). I couldn't find a way to execute shell commands using the rc system or dhclient, what did I miss? You can use a '/etc/start_if.' file. If your NIC is fxp0 then a '/etc/start_if.fxp0' file will be run or sourced by the 'rc' system. In http://www.bsdforums.org/forums/showthread.php?t=34607 this type of file is used to set a MTU of 1492 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Execute command upon interface initialization?
On Tue, Apr 17, 2007 at 12:35:41PM -0400, Lowell Gilbert wrote:
> Roland Smith <[EMAIL PROTECTED]> writes:
>
> > On Tue, Apr 17, 2007 at 06:02:25PM +0300, Ido Admon wrote:
> >> Hello list,
> >> I couldn't find any way to execute an arbitrary command upon network
> >> interface initialization. My situations is that I have and ethernet card
> >> that takes DHCP from a cables provider (not a fixed IP address) and I
> >> need to update a DynDNS hostname everytime it does (everytime the IP
> >> changes).
> >> I couldn't find a way to execute shell commands using the rc system or
> >> dhclient, what did I miss?
> >
> > dhclient-script(8)? Maybe devd(8) will work as well.
Just in case you don't manage to find the appropriate text...
You'll need to create (in this instance) an /etc/dhclient-exit-hooks
script. An excerpt from mine is below, you'll need to create your own
"update_ddns" function to update your DynDNS entry.
if test "$reason" = "RENEW" || test "$reason" = "BOUND"; then
# The old lease has been renewed or the interface is being re-bound.
if test "$old_ip_address" != "$new_ip_address"; then
# IP address has changed -- update DDNS entry.
update_ddns
fi
fi
Hope it helps.
>
> devd won't work as well, because the timing is a bit off (even if you
> only get new addresses at boot time, which isn't guaranteed.
>
> dhclient-script already has a capability ("hooks") for running scripts
> at the appropriate times. If you check the mailing list archive, I
> know I have previously posted the script I used to use for exactly the
> same purpose.
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--
kelvin
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Re: Execute command upon interface initialization?
Ido Admon wrote: Hello list, I couldn't find any way to execute an arbitrary command upon network interface initialization. My situations is that I have and ethernet card that takes DHCP from a cables provider (not a fixed IP address) and I need to update a DynDNS hostname everytime it does (everytime the IP changes). I couldn't find a way to execute shell commands using the rc system or dhclient, what did I miss? Sure I could just use cron but that's not very elegant. You could use dns/ez-ipupdate. It is a daemon who updates your dyndns whenever your ip is changed. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Execute command upon interface initialization?
Roland Smith <[EMAIL PROTECTED]> writes:
> On Tue, Apr 17, 2007 at 06:02:25PM +0300, Ido Admon wrote:
>> Hello list,
>> I couldn't find any way to execute an arbitrary command upon network
>> interface initialization. My situations is that I have and ethernet card
>> that takes DHCP from a cables provider (not a fixed IP address) and I
>> need to update a DynDNS hostname everytime it does (everytime the IP
>> changes).
>> I couldn't find a way to execute shell commands using the rc system or
>> dhclient, what did I miss?
>
> dhclient-script(8)? Maybe devd(8) will work as well.
devd won't work as well, because the timing is a bit off (even if you
only get new addresses at boot time, which isn't guaranteed.
dhclient-script already has a capability ("hooks") for running scripts
at the appropriate times. If you check the mailing list archive, I
know I have previously posted the script I used to use for exactly the
same purpose.
___
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Re: Execute command upon interface initialization?
On Tue, Apr 17, 2007 at 06:02:25PM +0300, Ido Admon wrote: > Hello list, > I couldn't find any way to execute an arbitrary command upon network > interface initialization. My situations is that I have and ethernet card > that takes DHCP from a cables provider (not a fixed IP address) and I > need to update a DynDNS hostname everytime it does (everytime the IP > changes). > I couldn't find a way to execute shell commands using the rc system or > dhclient, what did I miss? dhclient-script(8)? Maybe devd(8) will work as well. > Sure I could just use cron but that's not very elegant. On the other hand it is simple, which is a virtue in itself. Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725) pgprLIA6NHfrM.pgp Description: PGP signature
