Hi, <snip: from my snort 1.8b5 snort.conf> # Define the addresses of DNS servers and other hosts # if you want to ignore portscan false alarms from them... var DNS_SERVERS $HOME_NET [...] # Use portscan-ignorehosts to ignore TCP SYN and UDP "scans" from # specific networks or hosts to reduce false alerts. It is typical # to see many false alerts from DNS servers so you may want to # add your DNS servers here. You can all multiple hosts/networks # in a whitespace-delimited list. # #preprocessor portscan-ignorehosts: $DNS_SERVERS </snip> 99.9% chance this is legitimate traffic. Most people add their DNS servers to portscan-ignorehosts variable. This will prevent these from being logged. bye, dmuz -----Original Message----- From: Michael Clark [mailto:mdcat_private] Sent: Tuesday, May 29, 2001 10:44 AM To: incidentsat_private Subject: UDP scan from DNS server? Snort grabbed the following traces last night. The source is my ISP's DNS server. Any ideas? May 28 21:42:40 111.222.333.444:53 -> 192.168.1.1:61068 UDP May 28 21:42:43 111.222.333.444:53 -> 192.168.1.1:61069 UDP May 28 21:42:43 111.222.333.444:53 -> 192.168.1.1:61070 UDP May 28 21:42:43 111.222.333.444:53 -> 192.168.1.1:61071 UDP May 28 21:42:43 111.222.333.444:53 -> 192.168.1.1:61072 UDP May 28 21:42:44 111.222.333.444:53 -> 192.168.1.1:61073 UDP May 28 21:42:53 111.222.333.444:53 -> 192.168.1.1:61074 UDP May 28 21:48:32 111.222.333.444:53 -> 192.168.1.1:61074 UDP May 28 21:48:33 111.222.333.444:53 -> 192.168.1.1:61075 UDP May 28 21:48:33 111.222.333.444:53 -> 192.168.1.1:61076 UDP May 28 21:48:33 111.222.333.444:53 -> 192.168.1.1:61078 UDP May 28 21:48:33 111.222.333.444:53 -> 192.168.1.1:61079 UDP May 28 21:48:33 111.222.333.444:53 -> 192.168.1.1:61077 UDP May 28 21:48:33 111.222.333.444:53 -> 192.168.1.1:61081 UDP May 28 21:48:33 111.222.333.444:53 -> 192.168.1.1:61082 UDP May 28 21:48:34 111.222.333.444:53 -> 192.168.1.1:61083 UDP May 28 21:48:34 111.222.333.444:53 -> 192.168.1.1:61084 UDP May 28 21:48:34 111.222.333.444:53 -> 192.168.1.1:61085 UDP May 28 21:48:34 111.222.333.444:53 -> 192.168.1.1:61086 UDP May 28 21:48:35 111.222.333.444:53 -> 192.168.1.1:61080 UDP May 28 21:51:23 111.222.333.444:53 -> 192.168.1.1:61094 UDP May 28 21:51:24 111.222.333.444:53 -> 192.168.1.1:61095 UDP May 28 21:51:24 111.222.333.444:53 -> 192.168.1.1:61096 UDP May 28 21:51:24 111.222.333.444:53 -> 192.168.1.1:61097 UDP May 28 21:51:24 111.222.333.444:53 -> 192.168.1.1:61098 UDP May 28 21:55:44 111.222.333.444:53 -> 192.168.1.1:61107 UDP May 28 21:55:45 111.222.333.444:53 -> 192.168.1.1:61108 UDP May 28 21:55:46 111.222.333.444:53 -> 192.168.1.1:61109 UDP May 28 21:55:46 111.222.333.444:53 -> 192.168.1.1:61110 UDP May 28 21:55:47 111.222.333.444:53 -> 192.168.1.1:61111 UDP May 28 21:55:47 111.222.333.444:53 -> 192.168.1.1:61112 UDP May 28 21:56:02 111.222.333.444:53 -> 192.168.1.1:61113 UDP May 28 21:56:02 111.222.333.444:53 -> 192.168.1.1:61114 UDP May 28 21:56:05 111.222.333.444:53 -> 192.168.1.1:61115 UDP May 28 21:56:07 111.222.333.444:53 -> 192.168.1.1:61116 UDP May 28 21:56:18 111.222.333.444:53 -> 192.168.1.1:61117 UDP May 28 21:56:18 111.222.333.444:53 -> 192.168.1.1:61118 UDP May 28 21:57:06 111.222.333.444:53 -> 192.168.1.1:61118 UDP May 28 21:57:07 111.222.333.444:53 -> 192.168.1.1:61119 UDP May 28 21:57:07 111.222.333.444:53 -> 192.168.1.1:61120 UDP May 28 21:57:08 111.222.333.444:53 -> 192.168.1.1:61121 UDP May 28 21:57:09 111.222.333.444:53 -> 192.168.1.1:61122 UDP May 28 21:57:11 111.222.333.444:53 -> 192.168.1.1:61123 UDP May 28 23:16:51 111.222.333.444:53 -> 192.168.1.1:61139 UDP May 28 23:16:52 111.222.333.444:53 -> 192.168.1.1:61140 UDP May 28 23:16:52 111.222.333.444:53 -> 192.168.1.1:61141 UDP May 28 23:16:54 111.222.333.444:53 -> 192.168.1.1:61142 UDP May 28 23:16:54 111.222.333.444:53 -> 192.168.1.1:61143 UDP May 28 23:16:55 111.222.333.444:53 -> 192.168.1.1:61144 UDP May 28 23:16:56 111.222.333.444:53 -> 192.168.1.1:61145 UDP May 28 23:17:12 111.222.333.444:53 -> 192.168.1.1:61146 UDP May 28 23:17:15 111.222.333.444:53 -> 192.168.1.1:61147 UDP May 29 06:14:56 111.222.333.444:53 -> 192.168.1.1:61156 UDP May 29 06:14:56 111.222.333.444:53 -> 192.168.1.1:61157 UDP May 29 06:14:56 111.222.333.444:53 -> 192.168.1.1:61158 UDP May 29 06:14:57 111.222.333.444:53 -> 192.168.1.1:61159 UDP May 29 06:14:59 111.222.333.444:53 -> 192.168.1.1:61160 UDP May 29 06:14:59 111.222.333.444:53 -> 192.168.1.1:61161 UDP May 29 06:15:00 111.222.333.444:53 -> 192.168.1.1:61162 UDP May 29 06:15:02 111.222.333.444:53 -> 192.168.1.1:61163 UDP May 29 06:15:15 111.222.333.444:53 -> 192.168.1.1:61164 UDP May 29 06:15:19 111.222.333.444:53 -> 192.168.1.1:61165 UDP May 29 06:15:19 111.222.333.444:53 -> 192.168.1.1:61166 UDP Michael
This archive was generated by hypermail 2b30 : Tue May 29 2001 - 21:39:24 PDT