ISDN problems

[BIKEMAN]

Hi all   Thank you for your help on the speed of the ISDN connection. Most helpfull.   I'm afraid that my woes continue - the link is working fine, authenticated, can reach anything I want to, resolve to the DNS servers at the ISP, use the ISP's proxy but occasionally for a few minutes the workstations using the link cant access anything. I can still ping the ISP from the router but not from the workstations.   I'm not really sure if this is a router problem or a result of using the remote proxy but here is the meat of my config:   ip subnet-zero ip nat pool XXXXXX x.x.x.x x.x.x.x netmask x.x.x.x ip nat inside source list 1 pool xxxxxx overload no ip domain-lookup isdn switch-type basic-net3 ! interface Ethernet0  ip address x.x.x.x x.x.x.x  ip nat inside ! interface BRI0  description connected to Internet  no ip address  ip nat outside  encapsulation ppp  dialer rotary-group 1  dialer-group 1  no cdp enable ! interface Dialer1  description connected to Internet  ip address x.x.x.x x.x.x.x  ip nat outside  encapsulation ppp  no ip split-horizon  dialer in-band  dialer string xxxxxxxxx  dialer hold-queue 10  dialer-group 1  no cdp enable ! ip classless ip route 0.0.0.0 0.0.0.0 Dialer1 ip route 0.0.0.0 0.0.0.0 x.x.x.x access-list 1 permit x.x.x.0 0.0.0.255   All details that might identify the customer or compromise security should be gone.   Let me know if you have any ideas.   Thanks   Rudi