[Click] HELP:about make-ip-conf.pl

[吴保川]

hi everyone,
Now I am learning the configuration generated by make-ip-conf.pl. I have some questions.


First,
why the ip router does not send ARP queries? 
why the IP router just receive ARP queries and responses ?

Second,
what does the following mean? 
rt[0] -> EtherEncap(0x0800, 1:1:1:1:1:1, 2:2:2:2:2:2) -> toh; 
who is 1:1:1:1:1:1, who is  2:2:2:2:2:2 ? 
Does the element toh send the frames it received to the machine with MAC address 2:2:2:2:2:2? 

Third,
why FixIPSrc exists ?  
to my knowledge, if an IP packet is not used for source routing, there is no need for the router to modify the IP packet's source address. 
But in the configuration generated by make-ip-conf.pl, the IP address of every packet which need to be forwarded is modified, for the element FixIPSrc(18.26.4.92) and FixIPSrc(1.0.0.1).

Thank you!