Dear Maintainer,
I've run into the same problem after reconfiguring an existing dhcpd
into our networks. If the IP address of the host doesn't change, the
interface isn't reconfigured.
The offending line in /sbin/dhclient-script seems to be (starting from
line 210):
if [ -n "$old_ip_address" ] &&
[ "$old_ip_address" != "$new_ip_address" ]; then
# leased IP has changed => flush it
ip -4 addr flush dev ${interface} label ${interface}
fi
if [ -z "$old_ip_address" ] ||
[ "$old_ip_address" != "$new_ip_address" ] ||
[ "$reason" = "BOUND" ] || [ "$reason" = "REBOOT" ]; then
# new IP has been leased or leased IP changed => set it
ip -4 addr add
${new_ip_address}${new_subnet_mask:+/$new_subnet_mask} \
${new_broadcast_address:+broadcast $new_broadcast_address} \
dev ${interface} label ${interface}
It already uses $new_subnet_mask but it doesn't check in the if clause
if it have been changed from the current one.
IMHO the if clause should check not only for the subnet mask change
but any variable used inside that big if block such as:
- ip_address (currently checked)
- subnet_mask
- broadcast_address
- interface_mtu
On experimental, the RFC3442 gets incorporated into dhclient-script
instead of being defined under the hooks directory, which makes also
one more variable to check if it have been changed :
- rfc3442_classless_static_routers
Thus if your dhcpd sends a different value for the variables mentioned
above without changing the assigned IP address or during a initial
assignment, it will get ignored.
Many thanks