Lets say one part of my network is like this:

2 Clients connected "directly" thru a switch.

 

If Client 1 Pings client 2, from my understanding the ping goes directly Client1 -> switch -> Client2

I want to diagnose a problem with ping loss... 

 

Or does it go thru the router under the switch?

 

Client 1 | Client 2

Switch

Router

Edited November 14, 20196 yr by nuhll

When both clients are in the same network, e.g. 192.168.1.X then they will talke directly to each other via the switch.

 

The router only gets involved if the clients are each in a different network.

 

Okay, fine. Like i thought.

 

I found out that Clients -> Switch -> Router 1 -> Router 2 (and all hard connections between clients) seem to dont drop packets.

 

BUT the 2 routers which comes AFTER router 2, do drop pings. 1% ~~, its not much, but sometimes its like 26 pings (5sec each) so that is very very distruptive. (tested from clients)

NOW is the question is it because of the 2 routers AFTER router 2, or is it Router 2 which drops packets hes sending to WAN (Router 3 & 4)?

 

Do you know any clever way to find that out?

 

Clients

Router 1 (Google Wifi)

Router 2 (does load balancing)

-> Router 3 & 4

Edited November 14, 20196 yr by nuhll

Two main reasons why routers drop packets

1. Bad connection/cabling. Ensure all cables are properly seated and/or replace cables

2. Router overload. Too much traffic for the router to handle

 

Check if your routers provide any statistics about interfaces

Here is an example from my router

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether 18:e8:29:bd:80:c7 brd ff:ff:ff:ff:ff:ff
    inet 10.0.101.1/24 brd 10.0.101.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::1ae8:29ff:febd:80c7/64 scope link
       valid_lft forever preferred_lft forever
    Description: LAN

    RX:  bytes    packets     errors    dropped    overrun      mcast
    1569109171   11965971          0        337          0     368921
    TX:  bytes    packets     errors    dropped    carrier collisions
    27131680121   20486430          0          0          0          0

 

I found statistics for router 3 and 4.

 

For Router 2 i need to install a syslog server and let it run so this takes some time i guess.

 

Router 3 and 4 have crazy drops to the internet, but thats because its also bundling LTE. So thats normal. But i want to know why IN my LAN packets drops. Anyway could that have anything to do with it?! (i dont think)

Edited November 14, 20196 yr by nuhll