We have an issue with our cisco 887 router with a satellite internet router.
The satellite router (e.g. 128.182.191.105/30) has DHCP enabled, when a PC connecte to it, it automatically gives the IP address to the PC (e.g. 128.182.191.106/30). The PC can ping the router successfully, and can access internet. If we configure IP (e.g. 128.182.191.106/30) manually, it also works fine.
But when we connect the Cisco 887 with the same static IP (128.182.191.106/30), the cisco cannot ping the satellite router (128.182.191.105/30), and cannot access internet either. The interfaces of Cisco ( both vlan and fa3) are up. The "show int" shows that there are some packet come in and out form the interface of Cisco router. The "show mac" shows the cisco has learned the mac address of the satellite router. When the cisco router configured with dhcp client, it also cannot ge the IP address from the satellite router.
When we configure an PC (IP: 128.182.191.105/30) and directly connect to the cisco 887. Everything looks good. No communication issue between the PC and cisco 887.
There is not any special security options enabled on the satellite router. But the cisco 887 cannot communication with the satellite router.
Does anyone know what is the issue?
