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BeamOS – Routes

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Summary

The Routes page displays the router’s ARP table and active IPv4 and IPv6 routes. This chapter is an overview of the Routes page of BEAM routers.

ARP

The Address Resolution Protocol (ARP) is a communication protocol used for mapping an Internet Protocol address (IP address) to a physical machine’s link layer address (MAC address) belonging to the local network.

The ARP section displays the router’s ARP cache (also known as ARP table) data. The ARP cache contains information on each known MAC address and its corresponding IP address. When the router receives a packet destined for a local host, the ARP program attempts to find a physical host or MAC address in the ARP cache that matches the IP address. If the ARP cache doesn’t contain the needed IP address, ARP broadcasts a request packet to all LAN machines in order to find the device with the IP address in question.

The figure below is an example of the ARP cache section:

BeamOS Networking manual routes arp screen
Field Name
Value
Description
IP Address
ip; Default: none
IP address of a local host
MAC Address
mac; Default: none
MAC address of a local host
Interface
string; Default: none
Interface through which the router is associated with the host
You can also view the ARP cache via shell using the arp or ip neigh commands, depending on which output your prefer:

root@beam-onboard:~# arp
IP address HW type Flags HW address Mask Device
192.168.1.103 0x1 0x2 ac:e2:d3:00:00:00 * br-lan
192.168.1.151 0x1 0x2 18:d6:c7:00:00:00 * br-lan


root@beam-onboard:~# ip neigh
192.168.1.103 dev br-lan lladdr ac:e2:d3:00:00:00 REACHABLE
192.168.1.151 dev br-lan lladdr 18:d6:c7:00:00:00 REACHABLE

Active IP routes

The Active IP routes section displays the router’s routing table. A routing table contains a list of routes to network destinations associated with and known by the router.

The figure below is an example of the Active IP routes section:

BeamOS Networking manual routes arp screen
Field Name
Value
Description
Network
string; Default: none
Associated network interface name
Target
ip | ip/netmask; Default: none
Destination network address
IP Gateway
ip; Default: none
Indicates the IP address of the gateway through which the target network can be reached
Metric
integer [0..4,294,967,295]; Default: none
Metrics help the router choose the best route among multiple feasible routes to a destination. The route will go in the direction of the gateway with the lowest metric value
You can also view the routing table via shell using the route or ip route commands, depending on which output your prefer:

root@beam-onboard:~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 10.1.179.213 0.0.0.0 UG 0 0 0 wwan0
10.1.179.208 * 255.255.255.248 U 10 0 0 wwan0
10.1.179.213 * 255.255.255.255 UH 10 0 0 wwan0
192.168.1.0 * 255.255.255.0 U 0 0 0 br-lan
 
root@beam-onboard:~# ip route
default via 10.1.179.213 dev wwan0
10.1.179.208/29 dev wwan0 proto static scope link metric 10
10.1.179.213 dev wwan0 proto static scope link src 10.1.179.212 metric 10
192.168.1.0/24 dev br-lan proto kernel scope link src 192.168.1.1

Active IPv6 routes

The Active IPv6 routes section displays the router’s IPv6 routing table.

The figure below is an example of the Active IPv6 routes section:

Field Name
Value
Description
Network
string; Default: none
Associated network interface name
Target
ip | ip/netmask; Default: none
Destination network address
IP Gateway
ip; Default: none
Indicates the IPv6 address of the gateway through which the target network can be reached
Metric
integer [0..4,294,967,295]; Default: none
Metrics help the router choose the best route among multiple feasible routes to a destination. The route will go in the direction of the gateway with the lowest metric value
You can also view the routing table via shell using the route -A inet6 or ip -6 route show commands, depending on which output your prefer:
root@beam-onboard:~# ip -6 route
fe80::/64 dev wwan0 proto kernel metric 256
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