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Policy Based Routing, why do I need another default route?

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Lars Hanke

Using this tutorial I set up a server which receives a tagged VLAN trunk. I distribute the individual VLANs to various bridges for different purposes e.g., virtual machines. The following configures the bridge, with the interface of the server hardware to the network:

auto brwan
iface brwan inet static
  address 192.168.178.99
  netmask 255.255.255.0
  bridge_ports eth0.999
  bridge_fd 0
  bridge_nowait 0
  post-up ip route add 192.168.178.0/24 dev brwan src 192.168.178.99 table admin-vlan
  post-up ip route add default via 192.168.178.1 dev brwan table admin-vlan
  post-up ip rule add from 192.168.178.0/24 table admin-vlan
  post-up ip rule add to 192.168.178.0/24 table admin-vlan
  # why do I need this?
  post-up ip route add default via 192.168.178.1

ip route list and ip route list table admin-vlan look roughly identical. ip rule show has from 192.168.178.0/24 lookup admin-vlan. So why do I need the default route in the default table, too?

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