Networking & wireless forum: DoS attack or not?

by: Superskull85 May 17, 2013 4:08 PM PDT

Like this

0 people like this thread

Staff pick

Resolved question

DoS attack or not?

by Superskull85 - 5/17/13 4:08 PM

Hello,

For the last week I have been having problems with Internet connectivity inside a small network I manage. It just recently occurred to me that my problems may not be internal (as in problems with routers, switches, etc.) but instead maybe because of DoS attack.

I am not currently inside the network to run tests and I don't have a whole lot of experience dealing with larger scale attacks. I would rather my problems not be because of a DoS attack so I am hoping that by posting this topic I may get some other probable causes. I will only provide information as long as it does not compromise the network.

Let me start with some symptoms. Using a static IP address Internet connectivity will stay up anywhere from 1-3 hours at a time. During the time connectivity is available it could go down for 5-10 minutes a couple of tmes until connectivity is lost until I restart the network. Once the network is restarted connectivity is restored and all traffic (inbound and outbound) goes and comes successfully.

If I change IPs, update DNS records with my domain and restart the network connectivity will be restored for about 24 hours until connectivity is again lost.

If I change IPs but do not update DNS records with my domain I can maintain connectivity for an extended period of time. This usually works best with a dynamic IP setup.

I originally thought this was an issue with our main router. I updated the firmware after reading a note about older versions not reliably obtained an IP from ISPs (it was a very summarized note). That did not solve the issues and connectivity went down again within about 1 hour. After that downtime I switched to backup router and that too went down but without 2 hours.

Internal connectivity never drops and after consulting with my ISP (on another issue, somewhat related) they were able to ping my modem but would have some packet loss with our network connected. When our network is not connected they can ping the modem and get zero packet loss

After fiddling with the networking equipment I began thinking about DoS attacks. My issues seem to fit a DoS attack but the packet issue I described last makes me think otherwise.

So can anyone provide another possible reason for these symptoms? I can provide more information as long as it does not compromise the network. I am not physically within the network at the moment so I may not be able to run tests and such.

Any suggestions would be appreciated. happy

Forum Icon Legend

  • UnreadUnread
  • ReadRead
  • Locked threadLocked thread
  •   
  •   
  •   
  •   
  •   
  •   
  •   
  • ModeratorModerator
  • CNET StaffCNET Staff
  • Samsung StaffSamsung Staff
  • Norton Authorized Support TeamNorton Authorized Support Team
  • AVG StaffAVG Staff
  • avast! Staffavast! Staff
  • Webroot Support TeamWebroot Support Team
  • Acer Customer Experience TeamAcer Customer Experience Team
  • Windows Outreach TeamWindows Outreach Team
  • DISH staffDISH staff
  • Dell StaffDell Staff
  • Intel StaffIntel Staff
  • QuestionQuestion
  • Resolved questionResolved question
  • General discussionGeneral discussion
  • TipTip
  • Alert or warningAlert or warning
  • PraisePraise
  • RantRant

You are e-mailing the following post: Post Subject

Your e-mail address is used only to let the recipient know who sent the e-mail and in case of transmission error. Neither your address nor the recipient's address will be used for any other purpose.

Sorry, there was a problem emailing this post. Please try again.

Submit Email Cancel

Thank you. Sent email to

Close

Thank you. Sent email to

Close

You are reporting the following post: Post Subject

If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.

Offensive: Sexually explicit or offensive language

Spam: Advertisements or commercial links

Disruptive posting: Flaming or offending other users

Illegal activities: Promote cracked software, or other illegal content

Sorry, there was a problem submitting your post. Please try again.

Submit Report Cancel

Your message has been submitted and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.

Close

Your message has been submitted and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.

Close

You are posting a reply to: Post Subject

The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to the CNET Forums policies for details. All submitted content is subject to CBS Interactive Site Terms of Use.

You are currently tracking this discussion. Click here to manage your tracked discussions.

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

Sorry, there was a problem submitting your post. Please try again.

Sorry, there was a problem generating the preview. Please try again.

Duplicate posts are not allowed in the forums. Please edit your post and submit again.

Submit Reply Preview Cancel

Thank you, , your post has been submitted and will appear on our site shortly.

Close

You are requesting a clarification of the question: Post Subject

The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to the CNET Forums policies for details. All submitted content is subject to CBS Interactive Site Terms of Use.

You are currently tracking this discussion. Click here to manage your tracked discussions.

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

Sorry, there was a problem submitting your post. Please try again.

Sorry, there was a problem generating the preview. Please try again.

Submit Clarification Request Preview Cancel

Thank you, , your post has been submitted and will appear on our site shortly.

Close

You are posting an answer to the question: Post Subject

The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to the CNET Forums policies for details. All submitted content is subject to CBS Interactive Site Terms of Use.

You are currently tracking this discussion. Click here to manage your tracked discussions.

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

Sorry, there was a problem submitting your post. Please try again.

Sorry, there was a problem generating the preview. Please try again.

Submit Answer Preview Cancel

Thank you, , your post has been submitted and will appear on our site shortly.

Close
close

Click here to be notified via e-mail when someone submits an answer.

Would you like to resolve this question? close

Based on your response, it looks like this question has been answered.



Sorry, there was a problem resolving this question. Please try again.

Resolve Leave unresolved