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routable "broadcast" ip's not spoofed

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routable "broadcast" ip's not spoofed - 3.May2012 12:06:03 PM   


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Joined: 2.Nov.2006
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I am seeing an issue occasionally from mobile devices connecting to our activesync site. The mobile device gets an IP address of something like Now since this is a class C CIDR address, this is technically a broadcast IP. However a whois on this IP shows that it is owned by Vodafone UK, and they actually have a net of -, which really does fall outside the "correct" definition of a class C subnet.

Now since ISA server is set up to not route broadcast traffic, it can't deal with this so classifies it as a spoofed packet and drops it. At least I think that is what it is doing from what I have found on Technet.

Is there a way to fix this? Any workarounds?

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