On Wed, 2009-12-30 at 14:18 +0000, Rob Malpass wrote: > Hi all > > Season's greetings. > > Can anyone help fill (one of many) gaps in my networking knowhow? > > I got a Netgear ReadyNAS Duo for Christmas and performance has been > really slow. It seems the MTU is the culprit. Two problems: > 1) Should the MTU on the NAS (I've only ever seen MTU on routers > before) be set to the same as the MTU on the router? > 2) It seems the ReadyNAS insists on setting its own MTU as I've told > it to "Auto-negotiate" the Speed / Duplex mode. The other two > options for this setting are full or half duplex at 100MBps. I tried > both of these yesterday which resulted in the ReadyNAS basically dying > and only a factory reset brought it back so I'm loathe to do it again. > > And this brings me to a 3rd question come to think of it.... > > 3) Is it the MTU that will be affecting performance or is this a red > herring? > > Cheers > Rob > -- > Please post to: Hampshire@mailman.lug.org.uk > Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire > LUG URL: http://www.hantslug.org.uk > -------------------------------------------------------------- This may be nothing, but you are not blocking ICMP at all? I made a note of this from an old support job for similar issues:
* Router / Network Device between the sending server and the device having a smaller MTU and ICMP messages blocked. Although the connection is negotiated server to server, anything in the path that blocks ICMP Message TYPE 3 (Destination unreachable) Code 4 (Fragmentation Needed and Don't Fragment was Set) can cause this problem. This is probably *not* the issue but I HIH.... -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --------------------------------------------------------------
