15 Jan
2018
15 Jan
'18
9:43 p.m.
Some more notes on this:
The problem of accessing a Linux machine seems to be related to
the standard mtu of 1500 of a network interface.
Reducing the maximum packet size to 576 helps;
https://sourceforge.net/p/linux-decnet/mailman/message/2395733/
This can be done using ifconfig or using 576 instead of dst_mtu()
in dn_current_mss() af_decnet.c of the kernel module source.
tcpdump shows that a large data packet is one byte too long.
Perhaps this occurs because the pad byte in the header is not counted
in dn_mss_from_pmtu() in af_decnet.c; with an additional mtu--
this seems to be fixed.
Kernel warnings related to dst.h;
https://www.spinics.net/lists/netdev/msg225996.html
indeed disappear by using dst_metric_raw at two places.
The above was tested with kernel 3.10.17, and can be tested
with http://mim.update.uu.se/hecnet and nodename RULLFL.
dntype mim::nodenames.dat works very well on a real machine; why
it doesn't work very well with the virtual machine is not really
solved yet...
On Wed, Jan 03, 2018 at 04:44:54PM +0100, Johnny Billquist wrote:
On 2018-01-03 16:02, Erik Olofsen wrote:
On a virtual machine with lubuntu 12.04, kernel
3.2.0, I have
DECnet for Linux V.2.5.68s working, with dnprogs version 2.65.
It is node RULLFL.
The daemons and utilities use decnet.conf with node information,
so something useful would be to create it from mim::nodenames.dat.
On a VAX, TYPEing it works well, but on the Linux machine, dntype
hangs after giving parts of the file; dndir mim:: works well.
Does anyone have dntype mim::nodenames.dat working properly (with
perhaps different versions of the above)?
I can't help, but I can report that trying to read a file from a Linux
machine on MIM also hangs after a while.
A big problem with the DECnet/Linux implementation is that the developers
only ever tested against VMS, and nothing else.
I've known for ages that it does not play well with RSX. But I do not want
to dig into the Linux implementation.
(The Linux DAP claims to be a VMS system, by the way, which is probably also
not a good idea. Better if it had claimed to be some Unix derivative.)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol