__be16 payload_len; /* size of ppp payload, not inc. gre header */
__be16 call_id; /* peer's call_id for this session */
__be32 seq; /* sequence number. Present if S==1 */
- __be32 ack; /* seq number of highest packet recieved by */
+ __be32 ack; /* seq number of highest packet received by */
/* sender in this session */
};