Tizian-Maxime-Weigt/TCP-Flag-Combinations
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Tizian-Maxime-Weigt
2025-05-30 00:02:41 +00:00
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@@ -20,7 +20,7 @@
- **Ethernet Frame Size**: Includes 14 bytes Ethernet header + 4 bytes FCS. Minimum frame size is 64 bytes, maximum is 1518 bytes (without VLAN tagging). - **Ethernet Frame Size**: Includes 14 bytes Ethernet header + 4 bytes FCS. Minimum frame size is 64 bytes, maximum is 1518 bytes (without VLAN tagging).
- **URG Flag**: The URG flag is rarely used in modern protocols and should be closely monitored for potential misuse. - **URG Flag**: The URG flag is rarely used in modern protocols and should be closely monitored for potential misuse.
# TCP 3-Way Handshake # TCP 3-Way Handshake in Normal case
```mermaid ```mermaid
sequenceDiagram sequenceDiagram
@@ -33,7 +33,6 @@ sequenceDiagram
Note left of Client: Client receives SYN-ACK Note left of Client: Client receives SYN-ACK
Client->>Server: ACK Client->>Server: ACK
Note right of Server: Connection established Note right of Server: Connection established
```
# TCP 3-Way Handshake with Mitigation # TCP 3-Way Handshake with Mitigation
@@ -47,6 +46,5 @@ sequenceDiagram
Server-->>Client: SYN-ACK (seq = y, ack = x+1, cookie in seq) Server-->>Client: SYN-ACK (seq = y, ack = x+1, cookie in seq)
Note left of Client: Client receives SYN-ACK Note left of Client: Client receives SYN-ACK
Client->>Server: ACK (seq = x+1, ack = y+1) Client->>Server: ACK (seq = x+1, ack = y+1)
Note right of Server: Server validates cookie<br>If valid, reconstructs state and establishes connection Note right of Server: Server validates cookie<br>If valid, reconstructs state and establishes connection and save the IP for auto whitelisting
Note right of Server: Connection established Note right of Server: Connection established
```