Slow WAN link - both sides on same IP segment

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Sep 9th, 2009
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Inherited a goofy config. Site 1 and Site 2 are connected via a Pt to Pt T1. Users complined of slowness. Looking over config both sides are 172.16.x.x/16. One is .1 and one .2...but still same IP segment. Bridging is not enabled, but would braodcasts an other packets flow accross this?? Attached is interface config.


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Giuseppe Larosa Wed, 09/09/2009 - 11:39
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Hello Dave,

yes they are a flat subnet so there can be impact of broadcast traffic.

IP subnetting is needed here.

IP proxy-arp can help in mitigating the effects on end systems enabled on lan segments.

Also the subnet is simply too big and the level of broadcast is high.

Really a bad design unless there were some requirements on servers.

Hope to help



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