2 Mar
2026
2 Mar
'26
5:38 p.m.
I don't think I've ever tried that DDCMP mode. I don't even remember
what it does...
Why are you wanting to use it?
Johnny
On 02/03/2026 17.35, John H. Reinhardt wrote:
Greetings!
Mentioning pyDECnet might be a red herring, but that's what I'musing
to connect to HECnet so I'm mentioning it. I'm trying to connect to
Mark Matlock's RSX11M.COM (Static IP:216.177.191.101) and we are getting
some weird errors.
My pyDECnet circuit line looks like this - modeled after Supratim's
circuit config that he sent me last year.:
circuit DDCMP-30-1 DDCMP tcp:60001:rsx11m.com:7728 --t3=15 --cost=9
On Mark's side he has an RSX11M host as the area router and the
connection for me is set up thusly:
MNC SET CIR IP-0-5 MODE DDCMP
MNC SET CIR IP-0-5 TCP HOST 0.0.0.0:0 PORT 7728
NCP SET CIR IP-0-5 STA ON
The connection isn't working. Mark is seeing errors like this:
02:53:40 MLTNET - IP-0-5 Incoming packet size error (1541) from
76.213.76.105:51354. Abort.
02:53:42 MLTNET - IP-0-5 Incoming packet size error (1541) from
76.213.76.105:34404. Abort.
02:53:44 MLTNET - IP-0-5 Incoming packet size error (1541) from
76.213.76.105:34412. Abort.
The A17RTR node has what look to be the normal settings. the Segment
buffer size is normal for DDCMP.
NCP>tell a17rtr show exe char
Node Volatile Characteristics as of 2-MAR-2026 09:35:20
Executor node = 17.1023 (A17RTR)
Identification = THEMIS2 - A17RTR - DECnet/Python Area-17
Router at Saginaw, TX (DFW)
Management version = V4.0.0
Software identification = DECnet/Python V1.1.0
Incoming timer = 30
Outgoing timer = 30
NSP version = V4.0.0
Maximum links = 4095
Delay factor = 32
Delay weight = 3
Inactivity timer =300
Retransmit factor = 5
Routing version = V2.0.0
Type = area
Maximum area = 63
Area maximum cost = 128
Area maximum hops = 16
Segment buffer size = 576
Does anyone know what causes the packet size to be bigger than normal?
The ethernet interface on the pyDECnet host is set to 1500MTU as is my
firewall/router.
Where else can I look? I don't see anything in the pyDECnet
documentation that talks about DDCMP packet size. Where else can I look?
Regards,
John H. Reinhardt
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