Apr 29 08:13:42 tstack-centos5 dhclient: DHCPNAK from 10.1.10.1 (xid=0x4e17f141)
word  49:53                                                   ^--^                             from
 key  49:53                                                   ^--^                             from
ipv4  54:63                                                        ^-------^                   10.1.10.1
 val  54:63                                                        ^-------^                   10.1.10.1
pair  49:63                                                   ^------------^                   from 10.1.10.1
 key  65:65                                                                  ^                 
 key  65:68                                                                   ^-^              xid
 hex  69:79                                                                       ^--------^   0x4e17f141
 val  69:79                                                                       ^--------^   0x4e17f141
pair  65:79                                                                   ^------------^   xid=0x4e17f141
 grp  65:79                                                                   ^------------^   xid=0x4e17f141
 val  65:79                                                                   ^------------^   xid=0x4e17f141
pair  65:79                                                                   ^------------^   xid=0x4e17f141
msg         :DHCPNAK from 10.1.10.1 (xid=0x4e17f141)
format      :DHCPNAK from # (#)
{
    "from": "10.1.10.1",
    "col_0": [
        {
            "xid": "0x4e17f141"
        }
    ]
}