In a NetScaler, the NetScaler kernel routing table, the FreeBSD kernel routing
table, and the NSM FIB routing table each hold a different set of routes and serve
a different purpose. They communicate with each other using UNIX routing
sockets. Route updates are not automatically propagated from one routing table to
another. You must configure propagation of route updates for each routing table.
NS Kernel Routing Table
The NS kernel routing table holds subnet routes corresponding to the NSIP and to
each SNIP and MIP. Usually, no routes corresponding to VIPs are present in the
NS kernel routing table. The exception is a VIP added by using the add ns ip
command and configured with a netmask other than 255.255.255.255. If there are
multiple IP addresses belonging to the same subnet, they are abstracted as a single
subnet route. In addition, this table holds a route to the loopback network
(127.0.0.0) and any static routes added through the NetScaler command line
interface (nscli). The entries in this table are used by the NetScaler in packet
forwarding. From the nscli, they can be inspected with the show route
command.