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UPC cisco router firewall logging TCP or UDP based port scan from a UPC IP address

  • 09-02-2013 8:42pm
    #1
    Potency
    Registered Users, Registered Users 2 Posts: 104 ✭✭


    Cisco router: Cisco EPC2425
    This happens every few days at different times, along with an "Illegal TCP Header" from a US IP address (registered with comcast according to a whois).

    Here's an example of a logged message
    TCP- or UDP-based Port Scan 34 Sun Jan 13 16:11:01 2013 MyIP:61989 89.101.160.4:53 (this is UPC I think, so it's ok to post right?)
    Illegal TCP header 6 Sun Jan 13 16:12:33 2013 192.168.1.21:0 98.216.8*.***:0

    Always from the same IPs. What's wrong? Am I ok to keep letting this happen?


Comments

  • #2
    Spear
    Moderators, Computer Games Moderators, Technology & Internet Moderators, Help & Feedback Category Moderators Posts: 25,757 CMod ✭✭✭✭Spear


    Appears to be someone port scanning for DNS servers, but since you're not publicly exposing one it'll get nowhere and the firewall is doing its job.


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