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Files

Thomas Eizinger 9cd25d70d8 ci: prevent packet reordering by router containers (#10328 )

By default, RPS (Receive Packet Steering) is disabled on Linux which
means the CPU handling the interrupt for an incoming packet also handles
the packet. Under high-load, this can causes packet reordering in your
test setup where at least two routers are in the path between Client and
Gateway.

To ensure our test suite is deterministic, we enable RPS and set it to
1, meaning always CPU 1 will handle all packets.

Local testing has shown that this fixes the warnings of "packet counter
too old" on the Gateway and instead, all packets arrive entirely in
order.

Source:
https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/performance_tuning_guide/network-rps

2025-09-11 06:54:05 +00:00

Dockerfile

ci: create a more realistic network setup (#10301 )

2025-09-10 23:37:16 +00:00

README.md

ci: create a more realistic network setup (#10301 )

2025-09-10 23:37:16 +00:00

router.nft

ci: create a more realistic network setup (#10301 )

2025-09-10 23:37:16 +00:00

router.sh

ci: prevent packet reordering by router containers (#10328 )

2025-09-11 06:54:05 +00:00

README.md

Router

This container acts as a simple router how they are found on the public Internet. By default, no inbound traffic is allowed, except for:

responses of previously outgoing connections
explicit port forwarding

The router uses nftables to enforce these rules.

We also make several assumptions about the docker-compose setup that we are running in:

The network interface between the router and its container must be called internal
The public network interface on the other side must be called internet
IPv4 and IPv6 must be available on both interfaces