https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222899
Bug ID: 222899
Summary: After lease expiration dhclient-script mess up network
Product: Base System
Version: 10.4-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: cab...@yahoo.com
Configuration is like this:
/etc/dhclient.conf:
alias {
interface "rl0";
fixed-address 192.168.1.5;
option subnet-mask 255.255.255.0;
}
So, we have a dynamic address and fixed alias address.
So the interface looks like this:
rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=2008<VLAN_MTU,WOL_MAGIC>
ether xx:xx:xx:xx:xx:xx
hwaddr xx:xx:xx:xx:xx:xx
inet 192.168.0.11 netmask 0xffffff00 broadcast 192.168.0.255
inet 192.168.1.5 netmask 0xffffff00 broadcast 192.168.1.255
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
But, after the lease expires, dhclient-script renews lease, removes old dynamic
address and adds the new one, at the end of the list. Now it looks like this:
rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=2008<VLAN_MTU,WOL_MAGIC>
ether xx:xx:xx:xx:xx:xx
hwaddr xx:xx:xx:xx:xx:xx
inet 192.168.1.5 netmask 0xffffff00 broadcast 192.168.1.255
inet 192.168.0.11 netmask 0xffffff00 broadcast 192.168.0.255
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
This has an unintended consequence, that the default route now goes through
fixed alias interface, instead of dynamic interface. As the machine is the
router, it messes up the access to the outside for the rest of the local
network.
I propose a fix like this:
--- dhclient-script.orig 2017-10-09 18:46:39.912218000 +0200
+++ dhclient-script.new 2017-10-09 21:27:45.784826000 +0200
@@ -345,6 +345,7 @@
add_new_routes
fi
if [ "$new_ip_address" != "$alias_ip_address" ]; then
+ delete_old_alias
add_new_alias
fi
if is_default_interface; then
It will, in the RENEW phase, remove and add the alias, which will put it behind
the dynamic address, like it's suppose to be:
rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=2008<VLAN_MTU,WOL_MAGIC>
ether xx:xx:xx:xx:xx:xx
hwaddr xx:xx:xx:xx:xx:xx
inet 192.168.0.11 netmask 0xffffff00 broadcast 192.168.0.255
inet 192.168.1.5 netmask 0xffffff00 broadcast 192.168.1.255
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
Now the default route will again go through the dynamic address.
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