I have Cisco 877 device, I can connect to it via telnet, ssh or SDM from internal network with no problems. I would like to enable ssh and SDM access on the Public interface to manage the device from outside.
In SDM when I go to Additional Tasks -> Router Access -> Management Access I cannot select my Public interface from the drop-down list.
When I run a firewall wizard and try to enable Public interface for SDM and SSH I am getting a message that I need a static IP address configured on my Public interface.
In the list of interfaces my Public interface is PPPoA and IP address is set to "IP Negotiated", if I change it to static and enter IP that I got from provider aaa.bbb.ccc.ddd /32 I am getting "Please enter a valid IP address and a subnet mask" message. And I cannot think of anythig else to try.
Is there any way to enable SDM and SSH access on the public PPPoA interface?
Thank you very much.