Router after c6300

[bullaka]

I have a c6300. I also have a router after that. I use the c6300 network for my work wired and wireless. I have another router that is used for everything else in our house. I noticed WAY slower speeds on the router (I tried 2 different routers, one I already had and 1 I just purchased yesterday) and am getting the same results. That is. I get 300mbps at the cable modem wired and around 200 wireless. However, even when the other router is directly connected to the cable modem via a CAT5E cable, the 2nd router usually gets around 70mbps wired and half or less that wireless. I've even switched ports and ethernet cables, again CAT5E, to make sure neither of those were issues. Nothing changed. I did reset both the c6300 and the routers to make sure nothing was going on there. NOTHING changed speed-wise after the reset. I'm at a loss. 

Does anyone have any clue?

[antinode · Accepted solution]

> [...] I use the cable and port that was connected to the computer for
> the modem. Then I used a different port and cable for the computer.

   Ok.  And is that "different" cable tested or known-good?  The LED
indicators on a C6300 may not be good for much, but can you find any
information about the physical link rate at ADVANCED > ADVANCED Home :
Internet Port : Show Statistics?  Or from the other router/WAP, or the
computer OS?

   Blame assignment is Job One.  Is the hardware working as expected?  A
bad cable or port could limit your speed to 100Mb/s.  This whole
diagnosis thing might work better if _both_ of us were putting some
thought into it.

[antinode]

> I have a c6300. [...]

   Ok.

> [...] I also have a router after that. [...]

   Why?  Has your (unspecified) "a router" a maker and model number?
Connected to what, how?

> [...] (I tried 2 different routers, [...]

   Has either of them have a maker and model number?

   Have you tried configuring either of these (unspecified) "2 different
routers" as a wireless access point?   Specific advice is tough to offer
about unidentified devices.

[bullaka]

The router is: TP-Link AC1750

[antinode]

> The router is: TP-Link AC1750

   I'd look at the TP-Link documentation to see about configuring that
router as a WAP.

[bullaka]

I've completed the WAP setup. I'm seeing the same thing. I'm at a loss, especially when I can connect directly with the modem via ethernet from the modem to my computer and get 300mbps. Then when I go from the modem to the router using the same cable, it drops to the numbers I shared earlier: around 70mpbs.

[antinode]

> [...] I can connect directly with the modem via ethernet from the
> modem to my computer [...]

> [...] I go from the modem to the router using the same cable, [...]

   If you're "using the same cable" in a different place, then how is
the computer connected to the router?

[bullaka]

@antinode In the sense that I use the cable and port that was connected to the computer for the modem. Then I used a different port and cable for the computer.

[antinode · Accepted solution]

> [...] I use the cable and port that was connected to the computer for
> the modem. Then I used a different port and cable for the computer.

   Ok.  And is that "different" cable tested or known-good?  The LED
indicators on a C6300 may not be good for much, but can you find any
information about the physical link rate at ADVANCED > ADVANCED Home :
Internet Port : Show Statistics?  Or from the other router/WAP, or the
computer OS?

   Blame assignment is Job One.  Is the hardware working as expected?  A
bad cable or port could limit your speed to 100Mb/s.  This whole
diagnosis thing might work better if _both_ of us were putting some
thought into it.

[bullaka]

You nailed it @antinode! THANK YOU! I checked the Internet statistcs as you requested. Prior to that I had a hunch that the modem was slowing things down since I checked everything else. Once I checked the statistics it was showing LAN4: Link Down. I moved what was there and VIOLA everything is at the speeds it should be. Thanks again!