Greetings list, We have a few customers in the Fairfax County/Washington DC area with XO-provided T1 circuits that can only access hosts with an EVEN numbered last octet in their IP address. For example I personally host a server in Equinix Ashburn (with Carpathia) on a /28 and the XO T1's can only ping the EVEN numbered IPs, for example: 209.222.152.120 - can ping/http/etc 209.222.152.121 - no access 209.222.152.122 - can ping/http/etc 209.222.152.123 - no access The is doubly-confirmed via traceroute as only even numbered routers' responses make it back. Getting very slow/doubtful responses from XO support so I'm just reaching out to this list to see if anyone else is affected. I assume this is some sort of load balancing/spreading algorithm. Certainly never saw this particular outage before during my 15 years in the industry. Thanks all. - Cary Wiedemann --Misc Networking Engineering guy -- Sent from my mobile device