Comments (3)
aeppert
commented on May 27, 2024
When Stenographer records traffic, it appears to strip the outermost VLAN tag. I don't know if I would consider this a bug, but I definitely wasn't expecting this. I am aware of several environments that use QinQ tagging to signal which taps traffic is coming from and it would be convenient to make this a configurable setting.
I am assuming this is due to Stenographer using AF_PACKET. The VLAN tags are stripped at a lower layer and, unfortunately with my work on a few other things using AF_PACKET, it isn’t trivial to put them back together. It is possible, but with a decent performance impact as they have to be, per packet, re-applied. It is, perhaps, possible and may make sense to maintain a small state-store that could be built overtime and thus the performance penalties would smooth over the running time of stenographer.
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capton586
commented on May 27, 2024
Is there any way to avoid this issue?
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satta
commented on May 27, 2024
Maybe it could help disabling the NIC's VLAN offloading so the VLAN tags make it into AF_PACKET?
sudo ethtool -K <interface> rxvlan off
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Related Issues (20)
- Ubuntu 18.04 Seccomp Failures HOT 11
- gRPC support for stenoread HOT 7
- Feature Request: Utility to dump offline stenographer sensor data to pcap HOT 4
- [Ubuntu] Stenotype keeps crashing HOT 9
- Prometheus metrics support
- Stenographer will not start on Ubuntu 16.04LTS HOT 1
- Temporary directory created before dropping privileges
- Wishlist: Community ID indexed flow extraction
- multiple threads writing to same disk causes issues with disk cleanup HOT 10
- No such device exception seen while running install.sh on Ubuntu 18.04 HOT 1
- Export the packet through the stenoread and it will automatically break in 15 minutes HOT 1
- rpm created stenographer doesn't run HOT 3
- Notifying about index completion HOT 1
- Decapsulate ERSPAN
- Watchdog failure stenotype abort after 2 minutes (Debian 10) HOT 15
- BlockFile.AllPackets() fail when using non-standard blocksize
- Not able to set stenotype packet directory HOT 1
- Non-pretty results from output file open failure HOT 3
- PCAP-over-IP client in stenotype
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