The log file on our firewall is showing a log of dropped packets and spoofs, much of which appears to be generated from internal ip addresses, the internal ips are 199.29.166.xxx (see extract below); is this an indication of virus/spyware activity on our network? We're seeing occassional slow down of internet access which led me to check these logs in the first place. Any suggestion would be greatly appreciated.
08/30/2006 13:46:11.224 UDP packet dropped 202.97.238.205, 54972, WAN 193.120.102.237, 1026, WAN
08/30/2006 13:44:16.704 IP spoof dropped 199.29.166.135, 137, LAN 199.29.166.175, 137, OPT MAC address: 00.0D.9D.D3.7D.A0
08/30/2006 13:44:12.256 UDP packet dropped 202.97.238.132, 40530, WAN 193.120.102.237, 1026, WAN
08/30/2006 13:43:16.176 IP spoof dropped 199.29.166.134, 137, LAN 199.29.166.201, 137, OPT MAC address: 00.0F.1F.46.50.8B
08/30/2006 13:43:08.016 UDP packet dropped 221.208.208.91, 59156, WAN 193.120.102.237, 1026, WAN
08/30/2006 13:41:35.304 IP spoof dropped 199.29.166.100, 137, LAN 199.29.166.201, 137, OPT MAC address: 00.04.76.8E.0F.EB
08/30/2006 13:40:27.864 IP spoof dropped 199.29.166.111, 137, LAN 199.29.166.102, 137, OPT MAC address: 00.50.DA.DF.0C.C5
08/30/2006 13:36:31.576 UDP packet dropped 171.82.233.132, 45604, WAN 193.120.102.237, 1025, WAN
08/30/2006 13:35:36.144 IP spoof dropped 199.29.166.132, 137, LAN 199.29.166.106, 137, OPT MAC address: 00.0B.CD.B2.38.F0
08/30/2006 13:34:19.160 IP spoof dropped 199.29.166.100, 137, LAN 199.29.166.247, 137, OPT MAC address: 00.04.76.8E.0F.EB
08/30/2006 13:32:47.176 IP spoof dropped 199.29.166.102, 137, LAN 199.29.166.100, 137, OPT MAC address: 00.E0.18.C3.0E.F4
08/30/2006 13:32:17.688 ICMP packet dropped 24.31.153.21, 3, WAN 193.120.102.237, 3, WAN Dest Unreachable, Code: 3
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by: jasonpainePosted on 2006-08-30 at 14:48:32ID: 17424463
TCP, UDP and ICMP packet drops from the WAN (seen in firewall logs) are due to a constant stream of both innocent and malicious attempts to gain entry to your network.
You can get a sense for the overall patterns of this by looking at www.dshield.org. They collate firewall log data from around the world and give statistical summaries for the most attacked ports/protocols. The most commonly attacked ports for the last few years are 135, 137, 80, 1434 and 445. In all cases, the malicious exploits relate to major security holes in Windows hosts (which may be fixed in the latest hotfixes).
You may contact your ISP to investigate perceived malicious activity. Check Microsoft Knowledge Base Article 150543 or www.iana.org/assignments/p
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