> > If it were up to me, I'd simply back out this ``optimization':
> 
> Yes, that should be done unless somebody comes up with a fix. As it is
> it will make NetBSD's network appear unreliable because it is hard
> to figure what is causing such problems.

A little while ago, I wrote:

> In January, there was a thread entitled "UDP checksum trouble in -current"
> where corrupted UDP checksums were observed on the wire.  A workround was
> to set:  
> 
>   sysctl -w net.inet.udp.do_loopback_cksum=1
> 
> and a possible patch was posted in:
> 
>   http://mail-index.NetBSD.org/tech-net/2005/01/20/0000.html

What are the problems with applying this patch?  Alternatively, can we
reverse the default, so that checksums are switched on?

J

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