That's a vendor specific issue. Maybe you could take it up with them and ask what year they think this is? tv ----- Original Message ----- From: "Florian Weimer" <fw@deneb.enyo.de> To: "Seth Mattinen" <sethm@rollernet.us> Cc: "nanOG list" <nanog@nanog.org> Sent: Saturday, January 23, 2010 4:06 AM Subject: Re: Using /31 for router links
* Seth Mattinen:
In the past I've always used /30's for PTP connection subnets out of old habit (i.e. Ethernet that won't take unnumbered) but now I'm considering switching to /31's in order to stretch my IPv4 space further. Has anyone else does this? Good? Bad?
Bad. For some systems, such tricks work to some degree only due to lack of input validation, and you get failures down the road (ARP ceases to work, packet filters are not applied properly and other fun).
And now is not the time to conserve address space. You really should do everything you can to justify additional allocations from your RIR.