[strongSwan] road-warrior sends local DHCP requests through tunnel?

[Daniel Pocock]

I've configured a road warrior to use the rightsubnet=0.0.0.0/0 so that
all web activity should go via the tunnel

The road warrior is on a private LAN with a router/DHCP server.  It
should be sending the DHCP renewal requests to the local router but I
notice it sends them through the tunnel instead.

Can anybody comment on this?  Is it a gateway fault or an issue with the
road warrior?  Both systems are using StrongSwan on Debian