verbose dhcp output

[j bootlab org]

the connection seems fine, but at some point i get nonstop output to syslog:
Jan 16 10:48:51 localhost NetworkManager: DHCP: actual data length was 100
Jan 16 10:48:51 localhost NetworkManager: DHCP: Reply message was not not UDP (ip_hdr->protocol = 6, IPPROTO_UDP = 17), won't use it.
Jan 16 10:48:51 localhost NetworkManager: DHCP: Waiting for reply...
Jan 16 10:48:51 localhost NetworkManager: DHCP waiting for data, overall end_time = {1105885633s, -28774us}
Jan 16 10:48:51 localhost NetworkManager: DHCP waiting for data of minimum size 28, remaining timeout = {16701s, 91084us}
Jan 16 10:48:51 localhost NetworkManager: DHCP: Got some data to check for reply packet.
Jan 16 10:48:51 localhost NetworkManager: DHCP: actual data length was 1500
Jan 16 10:48:51 localhost NetworkManager: DHCP: Reply message was not not UDP (ip_hdr->protocol = 6, IPPROTO_UDP = 17), won't use it.
Jan 16 10:48:51 localhost NetworkManager: DHCP: Waiting for reply...
Jan 16 10:48:51 localhost NetworkManager: DHCP waiting for data, overall end_time = {1105885633s, -28774us}
Jan 16 10:48:51 localhost NetworkManager: DHCP waiting for data of minimum size 28, remaining timeout = {16701s, 66944us}

"actual data length was" is  most of the time 1500 and sometimes 100.
any idea what could cause this and/or how to silence it?

j