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[EricWilliams]

I'm having issues with my new Christmas present (DLink DIR-655), and I'm hoping I can get lucky and maybe someone's seen this before. I'd [exploitive deleted] to have a worthless present. 

I've been trying to debug the problem and have been researching it for days now to no avail. Anyway, I've got a DLink DIR-655 hooked up to my ADSL modem, which is resulting in noticeably slower browsing overall. Worse yet is that some sites have particularly slow browsing all the time now (IGN game boards), while others can't be connected to ever, not many how long I wait or how many times I try (USAA's site (my bank) and PSN).

There's definitely something fishy going on, because I can take the router out of the equation and things return to normal. Putting the router back in reveals the problems again. If it were just the PSN login on my PS3 giving me trouble, I might not be as worried since I know there's seemingly always issue to work through there, but as is, my PC's end is also suffering. I've tried putting my PS3 in the DMZ after giving it a static IP, and I've tried numerous DNS server pairs like OpenDNS's 208.67.222.222/208.67.220.220 and 4.2.2.2/4.2.2.3. None of this changed the results.

It's odd, because certain sites (even video sites) will load pretty fast, but the overall browsing experience on many sites was lowered, if not killed. Oh, and for what it's worth, the PS3 see the wireless signal and can use it fine. So I can browse the internet on the PS3 (though it still has the same issues as my PC), but I just can't log in to my PSN account . Not even once. With some things moving along fast and some things slow/broken, I feel like my new router is data racist against login sites or something. 

Anyway suggestions or past experiences that might help? Thanks.

EDIT: By the way, these issues existed with fw 1.11 and still with 1.21. Oh, and color me surprised at the "h"-word meaning the opposite of "like" being a bad word above.

[thecreator]

Hi Eric,

Given you said that you can simply disconnect the D-Link Router and reattach the ADSL Modem directly to the computer, tells me that the ASDL Modem was never sync'ed to the D-Link Router. This is probably the problem you are facing. You need to sync the ADSL Modem and Router together.

[arod]

Who is your service provider and what kind of modem do you have?
When you connect directly to your modem what IP address are you getting?

[funchords]

You might have more than one issue that needs to be resolved.  I think I can help you with this one: Consistently being able to view some sites but not others is a sign that the MTU value is incorrect for those sites.  The fix is easy. 

On Setup - Internet Settings - Manual Internet Connection Settings - change the MTU to 1460.  Then try accessing the site(s) that were giving you trouble. 

If that helps, then you can leave it at 1460, or you can try adding 8 bytes to the MTU (Maximum Transmission Unit):
 try  1468, 1476, 1484, 1492, or 1500 ... every 2 bumps will give you a one percent performance improvement. 1492 is a typical good value for DSL connections but some systems do require smaller.  1500 is typical for Ethernet.  If you're interested, you can research the rest easily enough via Google.

If that doesn't help, then return the MTU to its previous working value.

[EricWilliams]

First of all, I should mention that I live in Japan, so I'm sorry if my replies always end up seeming late.

Anyway, I'm at work now and can't try out your guys suggestions yet, but my provider is NTT by OCN. I can't say any specifics on the modem until I get home to check it out. I'll also try changing the MTU values. It sounds promising, at least.

TheCreator: What did you mean by "sync". Is that a term referring to a single process that can be completed by pressing some "sync" button, or is it referring to a series of things you do to get the two in sync?

Thanks

[EricWilliams]

Ahh!!! I love you! The change in MTU got it to work, but I had to go even further back. 1460 wasn't working, so I went ahead and jumped way down to 1428. It's working for the sites I mentioned, as well as the PS3, so now I'll be taking it up little by little. I'm not sure what that says about the quality of my ISP or whatever, but I'm sure it's nothing good.

I'm curious as to whether MTU settings are all-or-nothing. If I bump it up a couple notches to get performance like you mentioned, am I risking being "on the edge" where it won't work sometimes and I'll get cutoff? Or if it works, it works, end of story?

Thanks!

[funchords]

Ahh!!! I love you! The change in MTU got it to work, but I had to go even further back. 1460 wasn't working, so I went ahead and jumped way down to 1428. It's working for the sites I mentioned, as well as the PS3, so now I'll be taking it up little by little. I'm not sure what that says about the quality of my ISP or whatever, but I'm sure it's nothing good.

I'm curious as to whether MTU settings are all-or-nothing. If I bump it up a couple notches to get performance like you mentioned, am I risking being "on the edge" where it won't work sometimes and I'll get cutoff? Or if it works, it works, end of story?

Thanks!

1428 sounds like an "IPSEC tunnel" or something like that.  You're probably on the right number.

It is either "all-or-nothing" or almost so. The issue has to do with encapsulation -- so there might be a point where certain https sites or sites requiring login might not work, while others do.  If you find that, you might have to go back 8 bytes on the MTU.

Every 8 bytes is only about 00.5% more protocol efficiency -- so don't sweat the small stuff.