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Open TCP/UDP Ports

How do I close these open TCP/UDP Ports? by pmkincaid
Posted: 1 Jan 01

There are various ports that are normally open on a Cisco Router that can be easily turned off to further lock down the router.  These ports are as follows:

echo (TCP and UDP) - port 7
chargen (TCP and UDP) - port 19
daytime (TCP only) - port 13
discard (TCP and UDP) - port 9
finger - port 79
bootp - port 67/68

These can be turned off by the commands:
no service tcp-small-servers
no service udp-small-servers
no service finger
no ip bootp server

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