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Ip Route to NULL0?

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Author	Message
Scott Townsend Guest	Posted: Mon Apr 24, 2006 10:00 pm    Post subject: Ip Route to NULL0? We received a Router from an ISP and they have the Following Line in it. ip route A.B.C.0 255.255.255.0 Null0 254 permanent Where the local Ethernet Interface is: A.B.C.1 255.255.255.0 What is the Purpose of this? If the Ethernet interface is Down, route all traffic to NULL? Thanks, Scott<-
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Merv Guest	Posted: Mon Apr 24, 2006 10:08 pm    Post subject: Re: Ip Route to NULL0? correct
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java321 Guest	Posted: Tue Apr 25, 2006 5:42 am    Post subject: Re: Ip Route to NULL0? The purpose is to prevent routing loops. Here is an example http://www.cisco.com/en/US/tech/tk364/technologies_tech_note09186a00801c9a6e.shtml. Good Luck "Scott Townsend" <scott-i@.-N0-SPAMplease.enm.com> wrote in message news:on83g.19574$tN3.10995@newssvr27.news.prodigy.net... Quote: We received a Router from an ISP and they have the Following Line in it. ip route A.B.C.0 255.255.255.0 Null0 254 permanent Where the local Ethernet Interface is: A.B.C.1 255.255.255.0 What is the Purpose of this? If the Ethernet interface is Down, route all traffic to NULL? Thanks, Scott<-
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Mooron Guest	Posted: Tue Apr 25, 2006 7:50 pm    Post subject: Re: Ip Route to NULL0? Scott Townsend wrote: Quote: We received a Router from an ISP and they have the Following Line in it. ip route A.B.C.0 255.255.255.0 Null0 254 permanent Where the local Ethernet Interface is: A.B.C.1 255.255.255.0 What is the Purpose of this? If the Ethernet interface is Down, route all traffic to NULL? Thanks, Scott<- Also note the high metric of 254 which makes it the route of "last resort." A directly connected network has a metric of 0. Under normal cirucmastances, when the Ethernet is up, the route does nothing. It prevents bouncing of packets between you and your ISP when the Ethernet interface is down. - Mooron
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