--- job@instituut.net wrote: From: Job Snijders <job@instituut.net>

Curious whether it's commonplace to find systems that automatically regard .0 and .255 IP addresses (ipv4) as src/dst in packets as traffic that should be considered invalid. When you have a pool of assignable addresses, you should expect to see x.x.x.0 and x.x.x.255 in passing traffic (ie. VIP or NAT pool, or subnets larger than /24). Yet I've run into a commercial IP mgmt product and getting reports of M$ ISA proxy that is specifically blocking traffic for an IP ending in .0 or .255.

I used about a /15s worth of /23s for DHCP at a previous employer for 5 years (2005 - 2010) and they're still using them today years later. Never got one complaint AFAIK. I even got one of the .0 or .255 addresses for a while and never had trouble. This was discussed in detail a while back. Look in the archives. scott