Network Theory - IP operations - ICMP unreachable, redirect
10 important questions on Network Theory - IP operations - ICMP unreachable, redirect
What does "icmp unreachable" mean and what is the default?
ICMP unreachable notifies the sender if the router receives a packet it cannot deliver to the destination as it does not have a route to it.
Default enabled on a switch/router
What does the command (config)# ip icmp rate-limit unreachable [df] milliseconds mean?
rate limit ICMP destination unreachable messages
What is the command to disable icmp redirect and what is the default?
(config-if)#no ip redirects
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What is not reachable with ICMP type 3 code 3?
What is not reachable with ICMP type 3 code 4?
What is not reachable with ICMP type 3 code 5?
Used when packets must take configured hops (loose,strict routing)
What is ICMP type 3 code 9,10,13 used for?
What is ICMP type 3 code 11,12,14,15 used for?
What command can be used to test UDP port on a host?
11. IP Oper. - ICMP Unreachables 8:22
What are the questions when a router sends a redirect?
Are IP redirects enabled?
Is source IP from same network as the better next hop?
14. ICMP Redirects 7:40
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