Digital Watchdog Starlight D1363D Informations techniques télécharger pdf (Page 18)

fig 9: file dropdown

Both activate changes and reboot machine will prompt you to save any changes. If you say No, a reboot

will reset the system to its state just after the last time you saved your configuration. This, combined

with the system -> services -> ping watchdog, can save you a long trip if a change you made prevents

access to a remote system.

On bridges and routers

Most wireless systems are bridges by design. They learn about systems and IPs on each side and pass

packets between two network segments. Bridges look like switches. They do not appear in a

traceroute. In fact, they can be thought of as an electronic extension of the Ethernet cable that connects

them to the rest of the network. Bridges do not require IP addresses themselves, and it's easier to

understand what they are if we think about them as if they didn't have IP addresses. But it certainly

makes administration of the systems easier when they do have IP addresses.

Routers, on the other hand, have multiple IP addresses, always have IP addresses on two or more

networks, and have routing tables that tell them which interface to send packets on to send them on

their way. These routing tables can be static (hand made) or dynamic (built using software such as

quagga that monitors the network and talks to neighboring routers via one of RIP, BGP, OSPF, or other

routing protocols). Routers do show up in traceroutes.

Routers route packets between networks, and bridges span network segments into one network segment.

Therein lies the problem with bridges. Wireless bridges in particular offer an easy way to create loops

Except for the simplest of networks using wireless bridges, spanning tree protocol (STP) should always

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Digital Watchdog Starlight D1363D Informations techniques Page 18