O'Reilly logo

The Book of PF, 2nd Edition by Peter N.M. Hansteen

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Redundancy and Failover: CARP and pfsync

High availability and uninterrupted service have been both marketing buzzwords and coveted goals for IT professionals and network administrators as long as most of us can remember. To meet this perceived need and solve a few related problems, CARP and pfsync were added as two highly anticipated features in OpenBSD 3.5.

The Common Address Redundancy Protocol (CARP) was developed as a non-patent-encumbered alternative to the Virtual Router Redundancy Protocol (VRRP), which was quite far along the track to becoming an IETF-sanctioned standard, even though possible patent issues have not been resolved.[39]

One of the main purposes of CARP is to ensure that the network will keep functioning as usual, even when ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required