2 servers: Sparc 20 with 10.0.0.5 T1 with 10.0.0.16 1 Win98 laptop with 10.0.0.17 The T1 and Sparc 20 are physically separated via Cisco switch into two different rooms. In one room I connect T1 to the LAN. In other room, I connected S20 to the LAN. Netmasks on T1/S20/W98 are all set identically, with all having defaultrouter/gateway as 10.0.0.1. There are no duplicate IP addresses floating around. Problem: T1 CAN NOT ping S20. S20 CAN NOT ping T1. From another network, server 10.0.1.6 CAN ping and telnet successfully to S20 and T1. I disconnect T1 from LAN and connect it to hub. I connect W98 to the hub. They can ping each other to no end successfully. I connect the hub to the LAN, soon enough, W98 can not ping T1 and vice versa. However, soon enough, T1 CAN ping W98, but W98 CAN NOT ping T1. W98 machine CAN ping S20 after first ping fails, rest succeed. S20 CAN ping W98. S20 CAN NOT ping T1. I disconnect that hub from LAN, then the W98 and T1 can ping each other again. Any ideas?

Hi Please update the /etc/hosts file of both Sun machine i.e both machine should have each others IP address. Thanks & Regards sukrut

Thanks for the attention...but... I did not think your solution would work because I was trying to connect via IP address on all my attempts. However, I tried it anyway, and it did not work. Is there any incompatibility between Solaris and Cisco?

Very strange...! And what a brain buster. I'm thinking perhaps there might be some problem with the network interface auto-negotiation, unlikely but a possibility. it seems weird that you can connect from another network. It would seem that the problem is on the local segment. Have you tried forcing the nic to 10baseT? Are the SS20 and T1 freshly installed or have they been reconfigured to these network addresses? If the latter is the case then it is indeed possible that something has been overlooked. a sys-unconfig may be worth trying on the sun boxes. If you only have the SS20 and the T1 on the switch, and isolate it from the router, can they ping each other successfully then? Also, you don't have any VLANS or anything set up on the switch do you? It might be worthwhile double checking the config to see if there's anything crazy in there.