hi, i just new in cisco i have cisco 1841, i already configure both Fastethernet and & serial0/0 and subinterface0.1. My problem is i can't ping the serial 0 ip using my PC. (ie. RtrLAN-ip 10.10.10.1, serial0.1 - 192.168.98.2, ISP-ip 192.168.98.1). U...