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Edivas's avatar
Edivas
Aspirant
Aug 24, 2016
Solved

xt_TCPMSS: bad length (160 bytes) meaning

Hi, anyone has an idea what does this error mean: Tue Aug 23 18:23:58 2016((GMT)) [SRX5308][Kernel][KERNEL] printk: 104130 messages suppressed. Tue Aug 23 18:23:58 2016((GMT)) [SRX5308][Kernel][KERN...
Security
Solutions
  • Edivas's avatar
    Edivas
    Aug 26, 2016

    Ok, found an answer what was the cause of it. In my case this was a ddos attack on our servers. I quess it overfilled the firewall with packets or connections. I enabled session limitting then and logs showed connetions from different adreses. That didn't help of course... still got locked out. Only checked the logs when it stopped.

    Thanks

     

JohnRo's avatar
JohnRo
NETGEAR Employee Retired
Aug 25, 2016

Hello Edivas, 

 

Welcome to the community! 

 

I'm not familiar with the error message you are getting, doing a search online shows different causes on why the error shows up. What changes have you made to the firewall/network before you got this error? How old is the router? 

 

Thanks, 

  • Edivas's avatar
    Edivas
    Aspirant
    Aug 26, 2016

    Ok, found an answer what was the cause of it. In my case this was a ddos attack on our servers. I quess it overfilled the firewall with packets or connections. I enabled session limitting then and logs showed connetions from different adreses. That didn't help of course... still got locked out. Only checked the logs when it stopped.

    Thanks

     

    • JohnRo's avatar
      JohnRo
      NETGEAR Employee Retired
      Aug 26, 2016

      Hi Edivas,

       

      I see. Try enabling "Block TCP flood", you can find this settin in Security>Firewall>Attack checks. See if this will help. 

       

      Thanks, 

      • Edivas's avatar
        Edivas
        Aspirant
        Aug 26, 2016

        "Block TCP flood" was enabled and set up at 40 packets per second, but it didn't help. Unless i need to set it to even lower value?

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