MTR results show significant packet loss on 2nd hop, what could be causing this?
- Thread starter ijakeguy
- Start date
camieabz
Splendid
- Jan 29, 2001
- 8,713
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2nd hop might be within your network, or it might be your ISP's gateway. You would have know your own internal network setup to ascertain which. How does your PC / device connect to the Internet? Is it connected to a router? Is it wireless? Does the router connect to a modem inside the house, or does the router have it's own modem?
Example: My PC connects to my router (which has its own modem) with a cable. My router is my first hop. The router connects to the wall, and my ISP's gateway is the 2nd hop.
One way to ascertain internal vs external hops is the response time. Internal hop response times should be instantaneous (e.g. 1ms), but external ones will be noticeably slower, and in the 10s or 100s of milliseconds.
If the 2nd hop's IP address is similar to the 1st hop (e.g. both are 192.168.x.x) it's part of your internal network.
Example: My PC connects to my router (which has its own modem) with a cable. My router is my first hop. The router connects to the wall, and my ISP's gateway is the 2nd hop.
One way to ascertain internal vs external hops is the response time. Internal hop response times should be instantaneous (e.g. 1ms), but external ones will be noticeably slower, and in the 10s or 100s of milliseconds.
If the 2nd hop's IP address is similar to the 1st hop (e.g. both are 192.168.x.x) it's part of your internal network.
It is partially a misunderstanding on how the tool works. If you actually had 75% packet loss in hop 2 it would cause loss in every hop past it since the traffic would get lost as it passes hop 2.
What it likely is the device does not feel like responding to you. Most routers treat ping/icmp traffic as low priority. If they are busy passing actual traffic...like your ping to hop xx....they will do that rather than waste their time responding to ping or sending time to live messages. Some have a limit on how many responses they will make in a certain time period which is why you sometimes get response and other you do not. This is all to prevent denial of service attacks against the router.
What it likely is the device does not feel like responding to you. Most routers treat ping/icmp traffic as low priority. If they are busy passing actual traffic...like your ping to hop xx....they will do that rather than waste their time responding to ping or sending time to live messages. Some have a limit on how many responses they will make in a certain time period which is why you sometimes get response and other you do not. This is all to prevent denial of service attacks against the router.
Thanks for replying! My router/modem is the same setup as you explained, combined. So what is the isp gateway? Could it still be my modem in light of this? Or perhaps my homes phone wiring that leads into the modem? I'm just so worried if it could be external phone lines.. if so I'm likely screwed and I work from home. This issue has caused me to take a technical leave of absence from work and anything external could mean no more job.
I've had this same issue about 3 months ago with the 2nd hop. I had old screenshots of it and only recently learned about hops to see that it was the same. Isp replaced modem and issue was resolved. I'm hoping it can still be a modem issue what do you think?
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