J.2. Networking commands

J.2. Networking commands
	Appendix J. Command line reference

J.2.1. Subnets

show subnets
show subnet <integer>

You can list all current subnets, or details of a specific subnet. This shows the same information as the web status pages for subnets.

J.2.2. Renegotiate DHCP for a subnet

dhcpc renegotiate subnet=<integer>

When the Firebrick is getting its own IP address(es) from an external DHCP source, you may sometimes want it to renegotiate this address (e.g. if you have disconnected and connected to a different DHCP server). This command will force the DHCP client to renegotiate for a particular subnet ID. You can find the ID number of your subnets with the show subnets command.

NB This is separate from the Firebrick's own DHCP server, which can allocate addresses to machines on a LAN (see the dhcp commands below).

This command is only available to ADMIN (and DEBUG) user levels. It should be used with caution as it will interrupt your connection to the external network, and it is very possible that you may be allocated a different IP address.

J.2.3. Ping and trace

ping <IPNameAddr> [table=<routetable>] [source=<IPAddr>]
     [gateway=<IPAddr>] [flow=<unsignedShort>] [count=<positiveInteger>]
     [ttl=<unsignedByte>] [size=<unsignedShort>] [xml=<boolean>]
traceroute <IPNameAddr> [table=<routetable>] [source=<IPAddr>]
     [gateway=<IPAddr>] [flow=<unsignedShort>] [count=<positiveInteger>]
     [ttl=<unsignedByte>] [size=<unsignedShort>] [xml=<boolean>]

This sends a series of ICMP echo requests (ping) to a specified destination and confirms a response is received and the round trip time. For the traceroute variant, the TTL/Hopcount is increased by one each time to show a series of response hops. There are a number of controls allowing you to fine tune what is sent. Obviously you should only send from a source address that will return to the FB2900 correctly. You can also ask for the results to be presented in an XML format.

Where possible, the reverse DNS name is shown next to replies, but there is (deliberately) no delay waiting for DNS responses, so you may find it useful to run a trace a second time as results from the first attempt will be cached.

J.2.4. Show a route from the routing table

show route <IPPrefix> [table=<routetable>]

Shows details of a route in the routing table. Where an individual IP is supplied, the route that would be used is shown. But if a prefix is supplied then the route for that prefix is shown, even though there may be more specific routes in use within it.

J.2.5. List routes

show routes [<IPFilter>] [table=<routetable>]

Lists routes in the routing table, limited to those that match the filter if specified.

J.2.6. List routing next hops

show route nexthop [<IPAddr>]

List the next hop addresses currently in use and their status.

J.2.7. See DHCP allocations

show dhcp [<IP4Addr>] [table=<routetable>]

Shows DHCP allocations, with option to show details for specific allocation.

J.2.8. Clear DHCP allocations

clear dhcp [ip=<IP4Range>] [table=<routetable>]

Allows you to remove one or more DHCP allocations.

J.2.9. Lock DHCP allocations

lock dhcp ip=<IP4Addr> [table=<routetable>]

Locks a DHCP allocation. This stops the allocation being used for any other MAC address even if long expired.

J.2.10. Unlock DHCP allocations

unlock dhcp ip=<IP4Addr> [table=<routetable>]

Unlocks a DHCP allocation, allowing the address to be re-used if it has expired.

J.2.11. Name DHCP allocations

name dhcp ip=<IP4Addr> [name=<string>] [table=<routetable>]

Allows you to set a name for a DHCP allocation, overriding the client name that was sent.

J.2.12. Show ARP/ND status

show arp
show arp <IPAddr>

Shows details of ARP and Neighbour discovery cache.

J.2.13. Show VRRP status

show vrrp

Lists all VRRP in use and current status.

J.2.14. Send Wake-on-LAN packet

wol interface=<string> mac=<hexBinary>

Send a wake-on-LAN packet to a specific interface.