15:02:10.763461 192.168.1.2.2222 > 224.2.2.2.2222: GSI 0x123456789abc len 0 SPM 1 path dcndspgm3.cs.ucl.ac.uk OPT[4] 12 
15:02:13.962977 192.168.1.2.2222 > 224.2.2.2.2222: GSI 0x123456789abc len 0 SPM 2 path dcndspgm3.cs.ucl.ac.uk OPT[4] 12 
15:02:15.665063 192.168.1.2.2222 > 224.2.2.2.2222: GSI 0x123456789abc len 1400 ODATA 1 trail 1 OPT[4] 12 send_nak 0.0.0.0 
15:02:15.783510