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Drop dhcpcd lease before connecting
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firespace
n00b
n00b


Joined: 13 Dec 2014
Posts: 1

PostPosted: Sat Dec 13, 2014 6:35 am    Post subject: Drop dhcpcd lease before connecting Reply with quote

I have a peculiar problem with my USB-modem. When modem is shut off, it forgets about all DHCP leases and it resets every time one tries to rebind a DHCP lease a modem knows nothing about, so if my modem gets disconnected due to a bad USB cable, I can no longer connect until I remove /var/lib/dhcp/*.lease. The problem is I don't know how to delete it automatically. I have already tried digging into configuration files, but to no avail.

Is there any way to make dhcpcd forget about a lease right after a link goes down or when a USB-modem goes up?
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khayyam
Watchman
Watchman


Joined: 07 Jun 2012
Posts: 6228
Location: Room 101

PostPosted: Sat Dec 13, 2014 11:16 am    Post subject: Re: Drop dhcpcd lease before connecting Reply with quote

firespace wrote:
Is there any way to make dhcpcd forget about a lease right after a link goes down or when a USB-modem goes up?

firespace ... are you using netifrc to manage the interface? If so you can do something like the following:

/etc/conf.d/net
Code:
preup() {
   [ -f "/var/lib/dhcpcd/dhcpcd-${IFACE}.lease" ] && {
      rm -f /var/lib/dhcpcd/dhcpcd-${IFACE}.lease
   }
   return 0
}

HTH & best ... khay
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lost+found
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Joined: 15 Nov 2004
Posts: 508
Location: North~Sea~Coa~s~~t~~~

PostPosted: Sat Dec 13, 2014 11:49 am    Post subject: Reply with quote

Welcome to the forums!

Another way is to use /etc/dhcpcd.enter-hook (See `dhcpcd-run-hooks' manual), and execute commands on dhcp events. Even a firewall script can be (re)run here.
Code:
case "${reason}" in
   #BOUND|INFORM|REBIND|REBOOT|TIMEOUT|STATIC)
   #   /root/scripts/firewall.sh &>/dev/null
   #   ;;
   PREINIT|NOCARRIER)
      rm -f /var/lib/dhcpcd/dhcpcd-eth0.lease
      ;;
esac
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UberLord
Retired Dev
Retired Dev


Joined: 18 Sep 2003
Posts: 6737
Location: Blighty

PostPosted: Sat Dec 13, 2014 2:00 pm    Post subject: Reply with quote

Or add
Code:
reboot 0
to dhcpcd.conf
_________________
Use dhcpcd for all your automated network configuration needs
Use dhcpcd-ui (GTK+/Qt) as your System Tray Network tool
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