This model allows for efficiency of routing updates and prevents unnecessary flooding.
Stretch’s post focused on the Cisco implementation, which is pretty straightforward, and since I’ve been tinkering with Vyatta lately, I wanted to publish some well-formed info on how this process works.
Instead of going with that model, OSPF elects one of the routers on the shared segment the Designated Router (DR), and another the Backup Designated Router (BDR).
Whenever a change occurs, an OSPF router will send an update to the multicast address 126.96.36.199, which sends the update to the DR and BDR.
Once neighbor relationships have been established, routing information must be distributed via Link State Advertisements, or LSAs.
In a shared-media environment, this can be problematic.
I’ve already shown how easy it is to integrate a Cisco router with a Vyatta router using OSPF, so you can use a mix of Cisco and Vyatta gear if you wish.
There are several reasons when you might need to clear your ARP cache.
There are two common ways on Linux systems, typically using the arp or ip utility.
For those who want to become (or stay) a Linux security expert.
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