William, If I was forced to guess...I'd guess they are running ATM-DXI on a HSSI interface. Older Cisco IOS versions exhibited similar behavior to what you are seeing below. Traffic flowed fine, but traceroute traffic star'ed out all the time. K william@pacific.net.ph on 08/26/98 02:55:23 PM To: nanog@merit.edu cc: (bcc: Kyle Bacon/Fnsi/US) Subject: Sprint/HiNet Hi all! Whenever we do a traceroute from our Sprint connection to a host in the HiNet network, we get timed out in the Sprint/HiNet link, as follows: Tracing route to w3.hinet.net [168.95.1.82] over a maximum of 30 hops: 1 138 ms 116 ms 113 ms pi-ph-ts01.pacific.net.ph [210.23.234.128] 2 142 ms 111 ms 116 ms pi-ph-gw01.pacific.net.ph [210.23.234.1] 3 332 ms 330 ms 340 ms 204.59.178.25 4 375 ms 324 ms 328 ms 204.59.120.198 5 323 ms 322 ms 339 ms 144.232.1.153 6 380 ms 366 ms 365 ms 144.232.8.70 7 347 ms 373 ms 374 ms 144.232.4.142 8 * * * Request timed out. 9 546 ms 529 ms 523 ms 168.95.253.126 10 540 ms 532 ms 540 ms 168.95.253.189 11 547 ms 556 ms 547 ms w3.hinet.net [168.95.1.82] Trace complete. Line 8 is always like this and a customer of ours is complaining about it. Is this a time out or congestion or something else? William