AS16604 works fine, AS 22663 does not. I've picked at this for several hours this AM - looks very much like 22663's serial interface, 144.232.250.20/30, is blackholed somewhere inside Sprint. I got a tech who is trying to help, but he is the guy who got stuck with Easter Sunday ... anyone else awake at Sprint? These machines can't telnet to each other. Protocol capture and varying the telnet source interface on the AS 22663 machine shows 144.232.250.22 can send but receives no return traffic, while the loopback IP is accessible. Inside AS 16604 interface Hssi3/0 description DS3 to Sprint PL#:431846 ip address 160.81.75.58 255.255.255.252 ip route 144.232.250.20 255.255.255.252 160.81.76.57 Inside AS 22663 interface Serial5/1/0 description 45076451-T, Prominic.net, Inc. (SL-PROMI-1) bandwidth 44210 ip address 144.232.250.22 255.255.255.252 interface Loopback 0 ip addresss 198.68.3.254 255.255.255.255 ip route 160.81.75.56 255.255.255.252 144.232.250.21 -- mailto:Neal@Layer3Arts.com // IM:layer3arts voice: 402 408 5951 cell : 402 301 9555 fax : 402 408 6902