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I have just obtained an old Cisco 877. I made sure to first push the reset button in the back. I then plugged into one of the LAN ports. The device gave me an IPv4 address (169.254.14.65/16) and an IPv6 address (fe80::9504:ecb9:b0b:e41%38)

I tried sniffing packets using Wireshark, and found that the Cisco device is broadcasting ARP packets. The message is: Who has 192.168.80.1? Tell 192.168.80.9

My understanding is that 192.168.80.9 should be the address of the Cisco router, yet it doesn't respond to ping or http/https requests.

PS. I am aware that generally to do Cisco config I need to use the console port which requires a console oprt. However I was playing around with trying to access this and was curious. Thanks :)

Stringers
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1 Answers1

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Your Cisco 877 didn't give you the 169.254.14.65/16 via DHCP; your computer decided it by itself (using Link-Local Address Selection, RFC 3927, 2.1), because DHCP failed. Possibly the device doesn't have DHCP server enabled. You are currently on a different subnet!

Set your IP address manually to be on the same subnet. If you are correct, that might be 192.168.80.0/24, but factory reseted Cisco 877 should have 10.10.10.1 by default, instead. If the network settings aren't restored to their defaults, also consider you may not have yet reseted the device successfully.

Community
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Esa Jokinen
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