Ip Hash Table - Digi TransPort WR31 User Manual

Manage networks and connections

IP hash table

The router uses an IP routing hash table to improve IPv4 routing performance by reducing route
lookup times. To view the IP hash table, go to Network Status > IP Hash Table. The IP Hash Table
contains information on recently routed IP packets such as source and destination IP address, IP
protocol, etc, plus information on the interface and gateway in use when routing the IP packet.
When the router receives an IP packet to route, it looks in the IP hash table before looking in the
IPv4 routing table. Whenever the IPv4 routing table changes (such as a route is added, deleted or
modified), all entries in the IP hash table are flushed out. To flush the IP hash table manually, click
the Flush button. If there is no use of the table for 10 seconds, the router deletes entries in the IP
hash table.
Src IP Address
The source IP address of the routed IP packet.
Src Port
The source TCP/UDP port of the routed IP packet. If the IP protocol is not TCP or UDP, then this
field is 0.
Destination IP Address
The destination IP address of the routed IP packet.
Dest Port
The destination TCP/UDP port of the routed IP packet. If the IP protocol is not TCP or UDP, this
field is 0.
Next Hop
The next hop gateway to which the routed IP packet was sent.
IP Protocol
The IP protocol field in the routed IP packet.
Interface
The interface in use when the IP packet was routed.
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