For the Sniffer to be able to capture packets it needs to be connected to a port that can see the packets without interferring with processing of the packets. If you have exactly what you have described, 2 PCs and 2 routers, then I do not see how you can use the Sniffer. If PCs are connected through a hub you can put the Sniffer on a port of the hub and capture the traffic. Or if the connection of PC to router or router to router is made through a switch you may be able to set up a SPAN port or a Monitor port and connect the Sniffer there to capture the traffic. But there is not a way to connect a Sniffer to a router port and see traffic from PC to router.
That means a sniffer should be on the same collision domain if I use a hub.
So if I connect a sniffer to a router port I can capture packets from router to router? Is it right.
Basically it should be placed on either PC1 or PC2.
So you can see what is coming into PC1 and what is going out of PC1 but what if I had about 50 switches or 50 routers. I just need a sniffer and connect to any port on the router or switch to inspect any type of traffic
How deploying a switched infrastructure eliminates Packet sniffing?.
Yes if you connect the Sniffer through a hub it will be in the same collision domain as the PC and the router.
How would you connect the Sniffer to the router port? If you use an Ethernet cable and connect the network card of the Sniffer directly to the router port, then there is not anything else connected on that router port and the router will not forward any traffic out that port, and the Sniffer will not see any traffic.
I think that you may not have fully understood my point before. Connecting Sniffer to a router port probably does not work well. Connecting Sniffer to a siwtch port can work well. The advantage of the switch is that you connect the Sniffer to a certain switch port. Then you make that switch port into a SPAN port or a Monitor port (depending on which type of switch) and the switch will make a copy of frames and send the copy to the monitor port and the Sniffer will capture that traffic.
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