Apr 29 08:13:42 tstack-centos5 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5 (xid=0xd16b79d)
 key  41:41                                          ^                                                                            
 sym  41:53                                           ^----------^                                                                DHCPDISCOVER
pair  41:53                                           ^----------^                                                                DHCPDISCOVER
 key  57:57                                                          ^                                                            
 sym  57:61                                                           ^--^                                                        eth0
pair  57:61                                                           ^--^                                                        eth0
 key  65:65                                                                  ^                                                    
ipv4  65:80                                                                   ^-------------^                                     255.255.255.255
pair  65:80                                                                   ^-------------^                                     255.255.255.255
 key  86:86                                                                                       ^                               
 num  86:88                                                                                        ^^                             67
pair  86:88                                                                                        ^^                             67
 key  98:98                                                                                                   ^                   
 num  98:99                                                                                                    ^                  5
pair  98:99                                                                                                    ^                  5
 key 101:101                                                                                                     ^                
 key 101:104                                                                                                      ^-^             xid
 hex 105:114                                                                                                          ^-------^   0xd16b79d
 val 105:114                                                                                                          ^-------^   0xd16b79d
pair 101:114                                                                                                      ^-----------^   xid=0xd16b79d
 grp 101:114                                                                                                      ^-----------^   xid=0xd16b79d
pair 101:114                                                                                                      ^-----------^   xid=0xd16b79d
msg         :DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5 (xid=0xd16b79d)
format      :# on # to # port # interval # (#)
{
    "col_0": "DHCPDISCOVER",
    "col_1": "eth0",
    "col_2": "255.255.255.255",
    "col_3": 67,
    "col_4": 5,
    "col_5": [
        {
            "xid": "0xd16b79d"
        }
    ]
}