clib_rwlock_reader_lock (&cnat_main.ts_lock);
cnat_timestamp_t *ts = pool_elt_at_index (cnat_timestamps, index);
ts->last_seen = t;
clib_rwlock_reader_lock (&cnat_main.ts_lock);
cnat_timestamp_t *ts = pool_elt_at_index (cnat_timestamps, index);
ts->last_seen = t;