What is the meaning of the foll. output of ping.

[root@dreams /root]# ping 192.168.42.1 PING 192.168.42.1 (192.168.42.1) from 192.168.42.244 : 56(84) bytes of data. Warning: time of day goes back, taking countermeasures. <-- (1) 64 bytes from 192.168.42.1: icmp_seq=0 ttl=255 time=689 usec 64 bytes from 192.168.42.1: icmp_seq=1 ttl=255 time=287 usec

My system time is alright in the above case.

[root@dreams /root]# ping 202.54.1.18 PING 202.54.1.18 (202.54.1.18) from 203.199.57.4 : 56(84) bytes of data. ping: sendto: Operation not permitted | ping: wrote 202.54.1.18 64 chars, ret=-1 | ping: sendto: Operation not permitted > <---(2) ping: wrote 202.54.1.18 64 chars, ret=-1 |