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protex
Tux's lil' helper
Joined: 03 Mar 2006
Posts: 88
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 Posted: Tue Aug 15, 2006 6:28 am Post subject: Interesting ping observation. |
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I setup my new DLink router (DI604) and have it working but my network speed is reduced by as much as 3 seconds on some sites.
Also, when I ping any server, my 'pongs' from those servers come back in groups of threes, with a 1 second break period in between them. Would this have something to do with my reduced internet speed, and if so, would that have something to do with my router?
Thanks in advance.
_________________
-Mitch
Desktop --> AMD Athlon XP 2600+@2GHZ, 1024mb DDR, BFG GeForce 6600GT OC, Gentoo (Emission guide)
Server --> AMD Duron 1300, 384mb, Gentoo Hardened
Laptop --> Intel Pentium II@399MHZ, 64mb, Gentoo |
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nielchiano
Veteran
Joined: 11 Nov 2003
Posts: 1287
Location: 50N 3E
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| Posted: Tue Aug 15, 2006 2:36 pm Post subject: Re: Interesting ping observation. |
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| protex wrote: | | Would this have something to do with my reduced internet speed, and if so, would that have something to do with my router? |
It wouldn't supprise me that it does.
Now, in anticipation for your next question "How can I solve it": It'd be useful to have a TCPDUMP that shows that behaviour.
Usualy, when my pings arrive per 3, it's "destination host unreachable" because of the ARP timeout.
Do you know how to make a tcpdump? |
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protex
Tux's lil' helper
Joined: 03 Mar 2006
Posts: 88
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| Posted: Wed Aug 16, 2006 2:27 am Post subject: Re: Interesting ping observation. |
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| nielchiano wrote: | | protex wrote: | | Would this have something to do with my reduced internet speed, and if so, would that have something to do with my router? |
It wouldn't supprise me that it does.
Now, in anticipation for your next question "How can I solve it": It'd be useful to have a TCPDUMP that shows that behaviour.
Usualy, when my pings arrive per 3, it's "destination host unreachable" because of the ARP timeout.
Do you know how to make a tcpdump? |
No sir. Could you explain how? And what I should be looking for in the dump? Thanks in advance!
_________________
-Mitch
Desktop --> AMD Athlon XP 2600+@2GHZ, 1024mb DDR, BFG GeForce 6600GT OC, Gentoo (Emission guide)
Server --> AMD Duron 1300, 384mb, Gentoo Hardened
Laptop --> Intel Pentium II@399MHZ, 64mb, Gentoo |
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James Wells
n00b
Joined: 10 Sep 2004
Posts: 57
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| Posted: Wed Aug 16, 2006 3:59 am Post subject: Re: Interesting ping observation. |
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Greetings,
| protex wrote: | | Also, when I ping any server, my 'pongs' from those servers come back in groups of threes, with a 1 second break period in between them. |
If your D-Link has the ability to change the MTU, that is one of the first things I would look at. If your MTU is too low, it can cause some of your outgoing ping packets to get clumped together. The internet default MTU is 1500, though many people will lower this to give a better interactivity for things like online FPS games, etc. |
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nielchiano
Veteran
Joined: 11 Nov 2003
Posts: 1287
Location: 50N 3E
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| Posted: Wed Aug 16, 2006 6:18 am Post subject: Re: Interesting ping observation. |
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| protex wrote: | | nielchiano wrote: | | Do you know how to make a tcpdump? |
Could you explain how? And what I should be looking for in the dump? Thanks in advance! |
You'll have to install tcpdump and ask him (as root) to dump the traffic: | Code: | emerge tcpdump
tcpdump |
It will display 1 line per packet received. you can redirect the output to file by using | Code: | | tcpdump | tee filename-to-write-to |
Just start the dump, do the thing that fails (ping) in another window and press CTRL-C. Then post the output.
BE SURE THAT YOU ARE LOCAL WHEN YOU DO!!! If you do this when logged in via SSH, you'll get an avalanche of packets. |
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