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[basilisk]

Hello all,

I posted here because I couldn't find a forum that covered D-Link gigabit network switches.  I own the DGS-1024D (non-RevC), and recently purchased a DNS-321.  I have no been able to get jumbo frames to work properly, and I suspect it is the switch.

My network consists of a DSL modem (10 Mbps, no jumbo frames), two PCs (one is Win7, the other is Ubuntu Linux) and the DNS-321.  I am able to enable jumbo frames (9k) on both PCs and the DNS-321, but as soon as the PCs are using jumbo frames, I lose the ability to connect to the DNS-321 (via web interface or SMB).  Connecting to the router is fine, so it seems they can still auto-negotiate down to the standard 1500 frame size.  If I configure the PC back to standard frame sizes, the link to the DNS-321 is restored.

The same seems to be the case going from the PC to the other PC.  So even though the DGS-1024D claims to support jumbo frames up to 9.6k (and I've seen posts from users that have it working), it doesn't seem to work in my case.  Any ideas?  Do I have a bad switch?

Thanks.

[bwomp99]

I think I am in a similar situation. I just got an Asus RT-N16 router and put tomato on it. I have been using a DNS-321, firmware 1.03 with my previous router (DIR-655) without a problem. Well, I had to get a new NIC and I noticed that when I set the jumbo frames on the NIC, I could not access the NAS. It could be pinged and would sometimes show up on the network, but I could not browse.

When I turned off jumbo frames on my NIC, access came back. I'm not sure if it is the router + jumbo frames problem, but that seemed to do the trick for me.

Now I need to figure out why the NAS will only connect at 100 instead of 1000.

[smoggysky]

hey guys, i seem to be in the same boat.. i just finished wiring my first home network. all cat 6 down to the jacks and plugs. i'm using a procurve 1400-24g switch with all devices going through this switch and a netgear 624 router between the network and the internet modem.(i will be up grading my router this week,i just purchased a netgear wndr3700 gigabit router.) i have 1 win7 pc,1 winxp pro pc,dual tv tuner,mac mini,ps3,dns321,hp c6150 printer all on the network. at first i had just the win7 with dns321 running at 100mps because of my pc net adapter card and i had no problem reading writing to the dns321. my switch shows the speeds that each device hooks at. the dns321 always shows gigabit speed.(but does not read/write at anything close to that speed.) when i up graded all my network pc's to gigabit cards,set the speeds to 1000t, my pc's will not see the dns321. i can ping it through command prompt with the ip address. but thats it. the jumbo frame rate works if the net speed it 100t or less. now i have set all devices on my network at auto-neg. speed and so far the dns321 has not disappeared. this is very frustrating. i will experiment with different settings for jumbo rate and network speed to see if i can go faster..

[jamieson]

Oddly enough, I'm getting better performance with Jumbo frames disabled.  My router and PC NIC both have jumbo support and I've cycled through all options from 4k to 9k MTU.  I'm wondering if some hardware interprets the max MTU as, say, 4000 bytes while other hardware may interpret this has 4096 bytes, resulting in truncation/resends.

[JoeSchmuck]

My NAS is set to 4K Jumbos while my NIC is set to 4096 Jumbo frames.  I'm using two different Gigabit switches between my PC and the NAS (located in tha basement).  In a few threads here we have discussed the optimum jumbo frame setting which ends up being 4K because most people transfer large files (like system backups), but if you are likely to be transferring a ton of smaller files more frequently, try 2K.  If you transfer small files like photos or documents all the time, disable jumbo frames for better performance for that type of file transfers.

As for Gigabit transfer speeds, nope, the processor in the NAS just isn't that fast.  Keep in mind that this is an entry level NAS, fine for home use, not something I'd never buy for work or for when a person needs a lot of throughput.

Questions for those folks having problems talking to the NAS with Jumbo frames enabled...  Can you see and transfer files to another computer connected to your network that also has jumbo frames enabled?
Also, a few small things to try, disconnect everything else from your network and try it.  Try a direct connection or a different switch.

-Joe

[gunrunnerjohn]

Oddly enough, I'm getting better performance with Jumbo frames disabled.  My router and PC NIC both have jumbo support and I've cycled through all options from 4k to 9k MTU.  I'm wondering if some hardware interprets the max MTU as, say, 4000 bytes while other hardware may interpret this has 4096 bytes, resulting in truncation/resends.

FWIW, I have the same experience.  The odd thing is, I used to have a RAID-0 array with two 500GB drives, EXT2, and 4K jumbo frames, and they were about 20% faster than without jumbo frames.  I changed the NAS to RAID-1, a pair of 1.5TB drives, and EXT3 and jumbo frames became slower than without them.  All of the equipment supported jumbo frames, AAMOF nothing in the path changed except the disks and format in the DNS-321.  There is something odd that happens in certain configurations, but I'm not sure what it is.

[JoeSchmuck]

You know, for the heck of it I messed around with my jumbo frames and for some odd reason my transfers of large files are faster (from ~4.9 MB/sec up to ~8MB/sec) than 4K or 9K jumbos.  I have changed my network switches since I first set this up and tested it.  I can say with certainty it did have higher throughput using jumbo frames before.  Things that have changed since my original install: I'm running EXT3 hard drives and they are not in a Raid setup, just two individual drives now.  I have added a second and new Gigabit switch and relocated my NAS to the basement.  I have enabled the UPnP AV Server as well.  Now as for my OS, I have changed from Vista to Windows 7 but on the same PC.

So, unfortunately there have been a lot of changes from my original setup and because of that I doubt I will do much troubleshooting since my NAS meets my needs of a backup device and actually serves up Blu-ray HD movies over my network (glad it could handle this) like Avatar and that's a 49GB movie, amazing!

So, even though the theory behind the jumbo frames should work, who knows what little quirks live in each system to throw a wrench into everything.

-Joe

[gunrunnerjohn]

Well, it confused me when jumbo frames ceased to have a beneficial effect on the network.  I have no idea what changed, but since I have 35-40mbytes/sec transfers to the Synology NAS, I stopped trying to improve it.  The two D-Link NAS units are strictly unattended backup, so the absolute speed of file transfers isn't all that significant.

[emanoyhl]

http://sd.wareonearth.com/~phil/jumbo.html

[gunrunnerjohn]

http://sd.wareonearth.com/~phil/jumbo.html

Gee, I'm sure glad you posted that, I had no idea what a jumbo frame was.    What are you, 13 or 14?

[JoeSchmuck]

Give the kid a break    I did have to check out that link, very basic info but good if this was the thread discussing what a Jumbo frame was.  I'm sure the kid had good intentions.

GRJ:  I was actually looking for a new NAS today but thankfully I talked myself out of it.  Sure, I'd like to have something a bit faster and with a few more drives, but unfortunately my wife said the money tree was picked clean again by some teenagers in the neighborhood.

Have a good one...
-Joe

[gunrunnerjohn]

Give the kid a break   

Well, he did come in and shotgun all the threads that were on the first page, after a few I was starting to get annoyed.