NAT Packet Loss

RouterOS General
1

I noticed packet loss when routing internet traffic. Does anyone have any idea what could be the issue here?

Device: rb2011uas-2hnd-in
RouterOS: 6.4

A more detailed description of the issue:

In attachment a Visio drawing of the network setup

I had first tried to disable PPPoE on the ISP router and create a PPPoE session on the RB2011. This worked just fine. After a while i noticed there were interruptions in internet radio streaming (which never occurred before). So i reenabled PPPoE on the ISP router and used double NATing for internet access on the local network. The problem remains the same.

At the same time as the streaming interruptions i notice a ping loss to the internet on other devices. When connecting the other devices directly to the ISP router, this does not occur. There are also no issues on the local network or the IP TV network. I think there must be an issue on L3 routing.

CPU load on the RB2011 never goes over 25%.
Network Setup.png

2

Can you post your config, please?

3

I have finally found a solution to my issue.
I connected my laptop to a VLAN 72 port and analyzed the traffic. I noticed that there were a lot of CDP and STP packets between the IP TV packets.
After disabling CDP and STP on the interfaceses that were used for IP TV all my problems dissapeared, and have stayed away for 2 weeks. When reenabling those services, they reappear.

I think i will leave them disabled for now :slight_smile: