Begging indulgence of the list - asking here because due to the higher likelyhood of getting an answer... I have an application that often loses connection from one machine to another when one (or more) of the machines has particular brands of 1gig nics, but which runs rock solid when on 10meg nics and some 1 gig nics. The application senses (falsely) that the connection has been shut down by the opposite end. It uses only TCP/IP, single socket at either end for alternate transmit/receive. Loss of connection happens when the socket is handed off to a spawned task (windows naturally). Never fails with 10meg nics. Never. Has anyone heard of such a thing, and what to do about it? -- ______________________________________ John Andersen NORCOM / Juneau, Alaska http://www.screenio.com/ (907) 790-3386 .
> Begging indulgence of the list - asking here because due > to the higher likelyhood of getting an answer... > > I have an application that often loses connection from one machine > to another when one (or more) of the machines has particular > brands of 1gig nics, but which runs rock solid when on 10meg > nics and some 1 gig nics. > > The application senses (falsely) that the connection has been shut down > by the opposite end. It uses only TCP/IP, single socket at either end > for alternate transmit/receive. Loss of connection happens when the > socket is handed off to a spawned task (windows naturally). Never fails > with 10meg nics. Never. > > Has anyone heard of such a thing, and what to do about > it?There is a very anoying problem with some new switches. They have a feature called ''broadcast protection'' which is enabled by default. We had the problem with some new broadcomm NICs where the autonegotiation of the NIC was considered as something bad by the ''broadcast protection'' and the port was disabled for ~30 seconds on the switch. This happened while we were testing adapter fault tolerance using the bonding device on Linux. It all turned out to be the stupid switches default config. Simon
On 24 Nov 2004 at 8:31, Simon Matter wrote:> > Begging indulgence of the list - asking here because due > > to the higher likelyhood of getting an answer... > > > > I have an application that often loses connection from onemachine> > to another when one (or more) of the machines has particularbrands> > of 1gig nics, but which runs rock solid when on 10meg nics and > > some 1 gig nics. > > There is a very anoying problem with some new switches. They have a > feature called ''broadcast protection'' which is enabled by default.Thanks, but... Well I don''t think I explained this very well. I don''t have a problem connecting but only when the daemon application on the server hands the connection off to a spawned task. Specifically the process known as Duplicating a socket. For some reason this fails but only with certain brands of 1gig nics. I thought it was due to the checksum offload capability of these nics but even turning that off did not help. I plan to run some tests locking the nic down to 10 or 100 meg. -- ______________________________________ John Andersen NORCOM / Juneau, Alaska http://www.screenio.com/ (907) 790-3386 .
Robert K Coffman Jr - Info From Data Corporation
2004-Nov-24 21:14 UTC
RE: OT: 1gigabit Nics
On an old (Asus A7A266) mainboard with Netgear nics, I''ve seen the net card just stop working altogether, particularly when launching something like bittorrent. The same card works fine on newer mainboards. Not sure if that might be related or not. I also found this link with a distressing reply from Netgear''s "support" organization. - Bob Coffman -----Original Message----- From: shorewall-users-bounces@lists.shorewall.net [mailto:shorewall-users-bounces@lists.shorewall.net]On Behalf Of John S. Andersen Sent: Wednesday, November 24, 2004 1:50 PM To: shorewall-users@lists.shorewall.net Subject: Re: [Shorewall-users] OT: 1gigabit Nics On 24 Nov 2004 at 8:31, Simon Matter wrote:> > Begging indulgence of the list - asking here because due > > to the higher likelyhood of getting an answer... > > > > I have an application that often loses connection from onemachine> > to another when one (or more) of the machines has particularbrands> > of 1gig nics, but which runs rock solid when on 10meg nics and > > some 1 gig nics. > > There is a very anoying problem with some new switches. They have a > feature called ''broadcast protection'' which is enabled by default.Thanks, but... Well I don''t think I explained this very well. I don''t have a problem connecting but only when the daemon application on the server hands the connection off to a spawned task. Specifically the process known as Duplicating a socket. For some reason this fails but only with certain brands of 1gig nics. I thought it was due to the checksum offload capability of these nics but even turning that off did not help. I plan to run some tests locking the nic down to 10 or 100 meg. -- ______________________________________ John Andersen NORCOM / Juneau, Alaska http://www.screenio.com/ (907) 790-3386 . _______________________________________________ Shorewall-users mailing list Post: Shorewall-users@lists.shorewall.net Subscribe/Unsubscribe: https://lists.shorewall.net/mailman/listinfo/shorewall-users Support: http://www.shorewall.net/support.htm FAQ: http://www.shorewall.net/FAQ.htm