Route Table

From the Table menu, select Route Table.

IP routing is the method by which a router chooses a path over which to send data (packets). A device can send data directly to another device as long as the two devices are in the same local (physical) network. When a device sends data to a device on another network, it must send it through a router.

A router looks at the destination address of the packet and checks its Route Table to determine where to send the packet next. The Route Table contains an entry for each route presently known to the router.

The columns in the Route Table show the following information:

Dest Address. The destination IP address of this route. An entry with a value of is considered a default route. Multiple such default routes can appear in the table, but access to such multiple entries is dependent on the table-access mechanisms defined by the network management protocol in use.

Index. The index value, which uniquely identifies the local interface through which the next hop of this route should be reached.

Metric1 – Metric4. Metric1 is the primary routing metric for this route; Metrics 2 through 4 are alternate routing metrics. The semantics of these metrics are determined by the routing-protocol specified in the route's Proto value. If a metric is not used, its value should be set to -1.

NextHopAddr. The Next Hop Address shows the IP address of the next hop of this route.

Type. The type or route: (1) = other, none of the following; (2) = invalid, an invalidated route; (3) = direct, route to a directly connected (sub-)network; (4) = remote, route to a non-local host/network/sub-network.

Proto. The IP routing protocol via which this route was learned. (1) = other,none of the following ; (2) = local, non-protocol information, e.g., manually configured entries; (3) = netmgmt, set via a network management protocol; (4) = .icmp, obtained via ICMP; the rest are gateway routing protocols: (5) = egp; (6) = ggp; (7) = hello; (8) = rip; (9) = is-is; (10) = es- is; (11) = CiscoIgrp; (12) = bbnSpfIgp; (13) = oigp

Inclusion of values for gateway routing protocols is not intended to imply that hosts should support those protocols.

Age. The number of seconds since this route was last updated or otherwise determined to be correct. Note that no semantics of "too old" can be implied except through knowledge of the routing protocol by which the route was learned. NOTE: To conserve bandwidth, fields on the screen are only gathered when you ask for them.  Thus some values, particularly times, may be out of date when viewed.  To update, press "F5".

Mask. The subnet mask associated with the IP address of this entry. The value of the mask is an IP address with all the network bits set to 1 and all the host bits set to 0.

Metric5. Alternate routing metric.

Info. Routing protocol information; set to zero by default.


See RFC 1213 and 1156 for complete descriptions of all objects.