Get Rid Of Stalled Downloads / Stalled Network Traffic

Ok, i searched the net back and forward for a solution to the fact that since i installed openSuse 10.3 on my HP dx5150 with Broadcom Gigabit onboard ethernet card, my network connection stalled everytime i'm downloading or uploading files to internal and external servers. Like till 20 to 30% goes well, then the whole downloading process stops, even Krusader giving back "stalled network".

A lot is to find on the web concerning linux installations and stalling network access. But most of the threads found are about ndiswrapper and wireless connection problems. Nothing seems to match my case... till... i found a thread on linuxquestions.org from "cidrolin" quoting a post of Cricket from fedoraforums.org, stating the following:

" Kernels 2.6.7. and higher come with changes to the tcp window size that (should) increase the efficiency of tcp. What it HAS done is expose a problem with the way some routers and firewalls handle requests for large windows. Those routers and firewalls just refuse to handle them; which is why you may be able to access some sites, but not others. The quick fix is to su to root and do two things:
# echo "net.ipv4.tcp_moderate_rcvbuf=0" >> /etc/sysctl.conf
# echo "net.ipv4.tcp_default_win_scale=0" >> /etc/sysctl.conf "

it did the trick!

Ok, maybe this is not for all of you the exact fix, but it was hard to find, the reason why i post this here.
For the record, i run a 3Com OfficeConnect Cable/DSL Router (3CR858-91), just a month or so old.

How would I know whether should I implement this tweak for my router?

How would I know whether should I implement this tweak for my router?
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dunno, try it out. There's no "list" of "bad" routers to be found on the net regarding this issue. IF you experiences the symptoms described, it's worth trying this tweak.

Thanks. But the symptoms described are generously common to nail, are there any other ways to identify, some form of log or something?

The only thing i have on hand is the router log always denied DoS attack from my machine, which is really awkward.

Hi

If your router is blocking what it thinks is a DoS attack from a local machine, it could be a malfunctioning NIC card thats sending out bad packets or a "noisy NIC" thats sending floods of bad packets along with normal traffic. I've only seen that happen once before, but its something to check.

Cheers

RK

Thanks. But the symptoms described are generously common to nail, are there any other ways to identify, some form of log or something?

The only thing i have on hand is the router log always denied DoS attack from my machine, which is really awkward.
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