Interesting ping observation.

[protex]

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.

[nielchiano]

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?

[protex]

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!

[James Wells]

Greetings,

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.

[nielchiano]

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: Select all

emerge tcpdump
tcpdump

It will display 1 line per packet received. you can redirect the output to file by using

Code: Select all

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.