Tizian-Maxime-Weigt/TCP-Flag-Combinations
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Tizian Maxime Weigt 2025-05-06 19:54:54 +00:00
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| Flag Combination | Flags Set (Hex) | Purpose | IP+TCP Payload Size | Ethernet Frame Size | XDP Filtering Logic |
|------------------|-----------------|---------|---------------------|---------------------|---------------------|
| SYN | 0x02 | Initiates connection | 40–59 bytes | 64–77 bytes | Rate limit SYN packets per source IP to prevent floods. Drop if rate exceeds threshold. |
| SYN | 0x02 | Initiates connection | 40–59 bytes | 64–77 bytes | Rate limit SYN packets per source IP to prevent floods. Drop if rate exceeds threshold. SynProxy |
| SYN-ACK | 0x12 | Acknowledges SYN | 40–59 bytes | 64–77 bytes | Validate against recent SYN requests using eBPF maps. Drop if no matching SYN. |
| ACK | 0x10 | Acknowledges data | 40 bytes | 64 bytes | Allow for established connections. Rate limit to prevent ACK floods. |
| PSH-ACK | 0x18 | Pushes data | 40–1500 bytes | 64–1518 bytes | Allow for data transfer. Rate limit large packets to prevent floods. |