L2TPv2 (l2tpv2)
- Layer: L4 (transport)
- Header: variable length
- Notes: Encapsulation and tunnels
Reached from
| Lower layer | Selector | Value |
|---|---|---|
udp | dst_port / src_port | 1701 (0x06a5) |
Fields
| Field | Type | Default | Auto | Description |
|---|---|---|---|---|
flags | flags(16) | 0x2 | L2TP flags and version (type, length, sequence, offset, priority bits). | |
body | bytes — rest of the PDU | "" | L2TP body (presence-conditional fields + payload); opaque octets. |
flags
| Bit | Mask | Name |
|---|---|---|
| 15 | 32768 (0x8000) | type_control |
| 14 | 16384 (0x4000) | length_present |
| 9 | 512 (0x0200) | sequence_present |
| 7 | 128 (0x0080) | offset_present |
| 3 | 8 (0x0008) | priority |
Sample templates
- l2tpv2 —
templates/protocols/encap/l2tpv2.wpg.yaml