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beepilot
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Packet drops transmitting packets via GRE Tunnel on CCR1016 & CCR2004

Fri Nov 26, 2021 8:21 pm

Has anyone experienced packet loss using GRE Tunnels on the CCR series?

We are experiencing appx 1% packet loss when we route packets from an ethernet interface to a GRE Tunnel.

Using the Mikrotik packet sniffer, we can see all of the packets when sniffing the GRE interface, so they are not getting dropped by the CPU.
However if we sniff the outbound interface using the same Mikrotik packet sniffer, appx 1% of these packets have disappeared.

We also see this same 1% loss of packets when adding counters using the IP firewall - the number of packets routed into the GRE interface is higher than the number which are transmitted out the ethernet interface.

These are all CPU routed packets, and this behavior is seen across all versions of the RouterOS we have tried, on both the CCR2004 and CCR1016 hardware platforms (we haven't tried any other platforms)

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