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bmilne1957Flag for United States of America

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Internet Cable modem only speeds good, they slow when a router is in place

A residential client I have has found (in Lower Alabama) when using only the Mediacom modem to the his PC with an dynamic WAN IP the speeds are as they should be. When he places a router/firewall on the LAN side everything slows way down. He should have 11 MB down 1.5 MB up. With the router in place he is getting about 2.15 MB down and .009 - .51 MB up.

We have tried two different routers, both lower end. The first thing I did was have him purchase a Ethernet only router and branch the wireless router from there. No difference. I use COX and I had some issues but when I replaced the DOCSIS 1.0 modem issued by COX with a DOCSIS 2.0 - everything worked fine. But my troubles were only getting 10 -11 MB down instead of 28 MB down. Upstream was OK. Now I run as advertised by COX..
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Darr247
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Many consumer-grade routers have a 10Mb jack and controller on the WAN/Internet port, because the average cable connection provides only about 6Mb download speeds.

Have you tried speed testing through the router from LAN to WAN when it's not connected to the modem?
That should help eliminate cables and other components that aren't in the picture when connected directly to the modem.

Then you could also try a different routers... e.g. the D-Link DIR-655 (on amazon) has gigabit ports on the LAN and WAN sides.
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The DLink router they have is D-Link EBR-2310 Ethernet Broadband Router: Interfaces:  WAN : 1 x 10Base-T/100Base-TX - RJ-45 ¦ LAN : 4 x 10Base-T/100Base-TX - RJ-45 .

Perhaps I am missing something but last time I checked a modem was needed to connect to the internet. Do you have a way to check through-put without actually being authenticated to your IPS?

If indeed it is only a 10MB port it still should give him better upand down stream speeds. If I'm missing something here please point out what it is.

Thank you.
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Darr247
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OK, I understand what your saying now. I'm going to give it a try over the weekend. Thanks for the clarification.
Tested the Router on another system - it handles 20 MB down and 8 MB up. Will have to call Mediaclown for more info.