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It is for home but I don't mind paying more to get something more customizable. I am kinda a devop.

What do you suggest?

I've got a TP-LINK Archer D7 and I want to relay the traffic from one of the connected devices to another instead of letting it go to internet.

The problem is that I couldn't access such configuration in modem's web panel. So I thought I ask you to lead me to another way for doing so. It would be best if I could configure modem's route table somehow.

I was't able to use anything useful by Wireshark. These are ICMP packets. Some stay unanswered so Wireshark says no response found.

Ping time isn't an issue. Ping is the first thing to get delayed by a box if it has other things to do. So if you are sending a lot of data ping response will go up.

How do you know you are dropping packets?

I ping ispdomain.com -t

How many?

1 in ten lines average.

What does the network look like between the source and dest?

It is the ISP itself so I can say direct link or one hop inside their networks at most.

If this is peer to peer do all peers drop packets, just one? What are you sending between the clients? What port and protocol are you using? The final answer might just be that packet loss is just a fact of the internet. Anything that runs over it needs to be able to deal with it.
-Otanx

For now I don't look at drops in P2P network. Drops and connection loss is very common in such networks. Diagnosing that will be an issue of itself.

I am familiar with Wireshark. I can track conversations on the wire and see who tells whom what. But I can't see how can I use it to see why I have dropped packets.

check the timestamp on the conversation.  example: if you have say a 800ms delay between SYN and SYN-ACK response,  the destination has issue.
if you receive SYN-ACK right away and there is delay with return ACK  the sender has issues,   assuming TCP

Genius. I will check it. What about UDP?

I am familiar with Wireshark. I can track conversations on the wire and see who tells whom what. But I can't see how can I use it to see why I have dropped packets.

I am developing on a P2P software project. My problem is that recently after I run this software I see drop packets an high ping times (between 300-800ms although normally it is about 40ms). Now I want to diagnose it to see that the problem is with my modem or ISP or the software is somehow messing up the network. I have 8Mb/6Kb ADSL bandwidth and a P-660HW-T1 v3 modem/router.

Any suggestions on where to look at? I suspected the number of connection may overload the modem but that won't even reach 30.

Edit: I should also note that my internet is OK when I download one file from internet. The download speed reaches about 6.7 Mb/s.