Table 213. PPP VJ Compression (vj)
| Field | Field Name | Type | Description |
|---|
| vj.ack_delta | Ack delta | Unsigned 16-bit integer | Delta for acknowledgment sequence number |
| vj.change_mask | Change mask | Unsigned 8-bit integer | |
| vj.change_mask_a | Ack number changed | Boolean | Acknowledgement sequence number changed |
| vj.change_mask_c | Connection changed | Boolean | Connection number changed |
| vj.change_mask_i | IP ID change != 1 | Boolean | IP ID changed by a value other than 1 |
| vj.change_mask_p | Push bit set | Boolean | TCP PSH flag set |
| vj.change_mask_s | Sequence number changed | Boolean | Sequence number changed |
| vj.change_mask_u | Urgent pointer set | Boolean | Urgent pointer set |
| vj.change_mask_w | Window changed | Boolean | TCP window changed |
| vj.connection_number | Connection number | Unsigned 8-bit integer | Connection number |
| vj.ip_id_delta | IP ID delta | Unsigned 16-bit integer | Delta for IP ID |
| vj.seq_delta | Sequence delta | Unsigned 16-bit integer | Delta for sequence number |
| vj.tcp_cksum | TCP checksum | Unsigned 16-bit integer | TCP checksum |
| vj.urp | Urgent pointer | Unsigned 16-bit integer | Urgent pointer |
| vj.win_delta | Window delta | Signed 16-bit integer | Delta for window |