It's about 3 weeks I have a strange problems with my routes... We have a linux box with 2 ISDN Modems connected for customer care + an ISDN router as default gateway for Internet and other connections. Until 3 weeks ago It was ok, I connected to my customers via modem or router and my box routed my packets whitout any problem to the correct destination. Now, the configuration is ok, the routing table is correct but packets (ping or everithing else) don't pass over the link for about 30 seconds after connection (sometimes 10", sometimes minutes...). It happens with either modem and router connections, even via default gateway... I tried to move the modems to another "just installed" box, but the problem seems to be the same. On another machine I installed 2 ISDN passive cards, but the problem remains. Everithing works ok, but I have to wait for strange timeouts to have my connection working. I can't understand what could be the cause... can you help me?
I found it... it was a dns problem... It solved names in addresses but not reverse... Fixed the dns the problem stopped to happen.