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networker050184 wrote: » You got it down. The switch doesn't change the source address though.
hiddenknight821 wrote: » I got a link that can reinforce your understanding. You can actually run a simulation of how ARP works by running the Ping. Check this out. Just make sure you use Wireshark heavily when dealing with understanding how framing works on the LAN side. I find it to be very helpful. You may want to examine the ARP frame.
MrXpert wrote: » thanks, but you said the switch doesn't change the source address(i assume you mean the MAC). Why is this?
MrXpert wrote: » Hi, I have learnt that layer 3 devices such as routers cannot forward on broadcasts(by default) but they can send out broadcast arps when wanting to know the mac of the next hop router. But i want to know is it the same the other way around? for example i logged into my router via console port and then pinged a dns server at ip 192.168.3.35(which is connected up to a switch which in turn is connected to the router i mentioned). Now the router didn't know the mac address of the dns server before i pinged 192.168.3.35. So did the router send out a broadcast arp asking "who is 0090.0CE2.A2D1?" The dns server replies back in a uni cast frame and says "thats me here's my MAC". The router caches this (as i saw when i typed arp). The router then is able to use the mac of the dns server when it constructs the packet and uses the souce mac as its own. Am i right so far? the router then sends it to 192.168.3.35 but does it pass by the switch? and if it does does the switch then look at it and alter the source mac addresses also? i hope i am making sense.
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