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ICMP Redirect , static routing

Last updated on December 30, 2018

        I am learning about ICMP Redirect and I struggle with understanding it.
For example, I have a network like this : photo I want to communicate from PC0 to PC1 which are on different subnet and at the beginning ICMP packet will be send to default gateway ( Router 3) 1) I have static routing like this : Router3 - > Router2 -> Router1 -> Router0 2) I have static routing like this : Router3 -> Router1 -> Router0 3) I have static routing like this : Router3 -> Router0 and please let me know if I am right ad 1 : there won't be ICMP redirect, because next hop of Router 3 , which is Router 2 isn't on the same subnet as PC0 is. Every time PC0 will communicate with PC1 the path will be PC0 -> Router3 -> Router2 -> Router1 -> Router0 -> PC1 ad 2: At the begining communication will be PC0 -> Router3 -> Router1 -> Router0 -> PC1 Then ICMP redirect will send and next communication will be PC0 -> Router1 -> Router0 -> PC1 and ICMP redirect will send again and next communication will be PC0 -> Router0 -> PC1 ad 3: At the begining PC0 -> Router3 -> Router0 -> PC1. Then, ICMP redirect and the path will be PC0 -> Router0 -> PC1 Sorry for my English

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