Tag: no ip source route
Harden your cisco router
by Rootadmin on Jul.18, 2009, under Cisco
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Commmand |
Description |
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no ip tcp-small-servers |
If you disable the minor TCP/IP servers, access to the Echo, Discard, Chargen, and Daytime ports cause the Cisco IOS® software to send a TCP RESET packet to the sender and discard the original incoming packet. |
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no ip udp-small-servers |
If you disable the servers, access to Echo, Discard, and Chargen ports causes the Cisco IOS® software to send an “ICMP port unreachable” message to the sender and discard the original incoming packet. |
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no ip bootp server |
This will send an ICMP port unreachable message to the sender and discard the original incoming packet |
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no service finger |
This is the equivalent of a remote show users command – disable it |
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no ip source route |
Disallow IP Source routing. |
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no ip ident |
IP Identd will return accurate information about the host TCP port, disabled this |
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no ip http server |
This is very important considering IOS® HTTP Authorization vulnerability. This will remove the ability to use http to manage Cisco devices. |
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no ip http secure-server |
This is very important considering IOS® HTTP Authorization vulnerability. This will remove the ability to use http to manage Cisco devices. |
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no cdp run |
to prevent reconnaissance against yoru network |
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ntp disable |
If you need to run NTP, run NTP securely |
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(Config-if) shutdown |
Shutdown all unused interfaces |
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(Config-if) no ip proxy-arp |
This prevents internal addresses from being revealed |
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(Config-if)no ip directed-broadcast |
Apply this to all interfaces that shouldn’t forward legitimate directed broadcasts |
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