High Latency between Router and Modem

I have a Asus RT-N56u router and I recently replaced my old Telkom modem with a D-Link DSL-2500U. The weird thing is my ping times have been spiking massively going from 9ms when inactive to 1500-2000ms during normal surfing. I pinged the modem and found that the spiking seems to be happening between router and modem.

The modem is set to bridged mode.

Does anyone have any idea on how to address this, D-link and Asus support have been less than helpful.

Hi There,
With the old Telkom modem did you also run it in bridge mode or is this something that you have changed?

It does sound a bit of an odd problem to now have. Can you try again with the old modem? It may be that the jnew modem is faulty.

Regards

Tim

Why are you running 2 modems/routers ?

Thanks Tim, unfortunately the old modem is poked, so I can't even get into the settings page to see what the config was. It was in bridge mode though.

I managed to sort it out with a firmware upgrade to both the router and the modem. I also noticed QOS was set to default on the modem, which I turned off, because this was handled by the router. That's sorted out part of my problem, the actual issue now is that any upload of data sends my ping time flying through the roof which is clearly a line issue.

Why are you running 2 modems/routers ?

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I'm not the Asus is a router only, and the D-Link is a modem.

kolakidd said:

I'm not the Asus is a router only, and the D-Link is a modem.

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Now please explain the difference to me. They do the same thing unless you are using one as AP.

kolakidd said:

the actual issue now is that any upload of data sends my ping time flying through the roof which is clearly a line issue.

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This is probably not a line issue, you will find this happen on any DSL line here you upload speed is 128kbit/sec - 1024kbit/sec. The solution is to add QoS to the upload queue on your router, and limit protocols that can max out the upload channels, as well as add prioritization to move ACK packets to the front of the queue at highest priority over any other type of packet. Once you have done that, you should see a massive improvement whilst upload.

I personally run a DC++ client at home which uploads 24/7, as well as NNTP downoads at 8Mbit/sec 24/7, and I can play games while this is all going on, because of the way I implemented QoS for both in and outbound traffic.