Starting DECnet hanging network connectivity
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Starting DECnet hanging network connectivity
Hi Everyone.
I'm building a new x86_64 OpenVMS E9.2-1 platform to migrate our application to from an hpe rx2660.
Have done a base deployment and configured DECnet IV and TCPIP. DECnet is required for some internal application communications.
However, I've noticed that when DECnet is started it prevents any network based connectivity to the host. If I disable it in sys$startup:systartup_vms.com then am able to telnet and ssh to the platform.
Has anyone else experienced this. Really appreciate your thoughts.
Thanks
Jason
I'm building a new x86_64 OpenVMS E9.2-1 platform to migrate our application to from an hpe rx2660.
Have done a base deployment and configured DECnet IV and TCPIP. DECnet is required for some internal application communications.
However, I've noticed that when DECnet is started it prevents any network based connectivity to the host. If I disable it in sys$startup:systartup_vms.com then am able to telnet and ssh to the platform.
Has anyone else experienced this. Really appreciate your thoughts.
Thanks
Jason
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Re: Starting DECnet hanging network connectivity
Which virtualization platform are you using (VirtualBox, KVM, Vmware Workstation, ESXi) ?
My idea is to check that the virtual network adapter is configured in "Promiscuous Mode": the node’s DECnet IV software resets the physical address to a new six-byte value AA-00-04-00-xx-yy, where xx-yy are two low-order bytes, calculated with the following formula: "convert the decimal node address to its hexadecimal equivalent [(area-number * 1024) + node-number, it should correspond to scsystemid kernel parameter] and reverse byte order".
If the virtual network adapter is not configured in "Promiscuous Mode", Decnet API will not be able to make this change and that could cause some trouble.
"Promiscuous Mode" setting is required also when you configure Lan Failover device LLxx.
I hope this helps.
/Maurizio
My idea is to check that the virtual network adapter is configured in "Promiscuous Mode": the node’s DECnet IV software resets the physical address to a new six-byte value AA-00-04-00-xx-yy, where xx-yy are two low-order bytes, calculated with the following formula: "convert the decimal node address to its hexadecimal equivalent [(area-number * 1024) + node-number, it should correspond to scsystemid kernel parameter] and reverse byte order".
If the virtual network adapter is not configured in "Promiscuous Mode", Decnet API will not be able to make this change and that could cause some trouble.
"Promiscuous Mode" setting is required also when you configure Lan Failover device LLxx.
I hope this helps.
/Maurizio
Last edited by m_detommaso on Wed Apr 05, 2023 5:46 am, edited 4 times in total.
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Re: Starting DECnet hanging network connectivity
What Maurizio said
But, also, if you are running phase V, you can disable the phase IV addressing in net$configure advanced. pick number 3, devices. For phase IV addressing question, say no.
From my machine:
I believe this will fix up your issue.
But, also, if you are running phase V, you can disable the phase IV addressing in net$configure advanced. pick number 3, devices. For phase IV addressing question, say no.
From my machine:
Code: Select all
You have the option of enabling Phase-IV addressing on this routing
circuit. This should be enabled on only one circuit per LAN.
* Enable Phase-IV Addressing on Routing Circuit 'CSMACD-0'? [YES] : no
Last edited by marty.stu on Fri Apr 14, 2023 5:25 pm, edited 2 times in total.
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Re: Starting DECnet hanging network connectivity
Hi Maurizio and Debbee
Many thanks to you both for the explanation.
We are using VMware ESXi VMware ESXi, 7.0.3.
The application requires DECnet for inter-process communication within the host. We are not using it for comms to the outside world.
Should we opt to use DECnet V, with DECnet IV disabled, would this get around the requirement for Promiscuous Mode?
A quick google indicates this needs to be enabled at the vswitch layer. I'm hoping our virtualisation team won't object to much to making this change.
Thanks again
Jason
Many thanks to you both for the explanation.
We are using VMware ESXi VMware ESXi, 7.0.3.
The application requires DECnet for inter-process communication within the host. We are not using it for comms to the outside world.
Should we opt to use DECnet V, with DECnet IV disabled, would this get around the requirement for Promiscuous Mode?
A quick google indicates this needs to be enabled at the vswitch layer. I'm hoping our virtualisation team won't object to much to making this change.
Thanks again
Jason
Last edited by jasonmirons on Wed Apr 12, 2023 9:14 am, edited 2 times in total.
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Re: Starting DECnet hanging network connectivity
Promiscuous mode is only required on the virtual NIC setting not the switch, especially if you are using a host only NIC for DECnet. Not using DECnet IV may also help.
Ian Miller
[ personal opinion only. usual disclaimers apply. Do not taunt happy fun ball ].
[ personal opinion only. usual disclaimers apply. Do not taunt happy fun ball ].
Re: Starting DECnet hanging network connectivity
This question no longer exists in 9.2 and I am having this problem. Everything worked fine before I configured DECnet-plus. I am running in VirtualBox and have the network adapter set to promiscuous “for all.” I can see the node in Angry IP Scanner and it shows that the MAC address has been changed to AA:00:04:00:02:04. Other than verifying the system is live on the network, however, I cannot reach the WebUI site on it nor can I SSH to it.debbee.west wrote: ↑Tue Apr 04, 2023 10:01 amCode: Select all
* Enable Phase-IV Addressing on Routing Circuit 'CSMACD-0'? [YES] : no
Last edited by xenophore on Tue May 09, 2023 7:03 pm, edited 1 time in total.
Peter Cox, CISSP
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Re: Starting DECnet hanging network connectivity
Decnet and TCP/IP protocol work fine in my Virtual Box environment. if you have set up NAT in your network configuration, try with Bridge.
/Maurizio
/Maurizio
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Re: Starting DECnet hanging network connectivity
This questions is only asked in @NET$CONFIGURE ADVANCED mode, when selecting [3]Configure Devices on this machinexenophore wrote: ↑Tue May 09, 2023 6:55 pmThis question no longer exists in 9.2 and I am having this problem.debbee.west wrote: ↑Tue Apr 04, 2023 10:01 amCode: Select all
* Enable Phase-IV Addressing on Routing Circuit 'CSMACD-0'? [YES] : no
If you answer the following question during initial configuration with 0.0, Phase-IV adressing would not be enabled.
* Enter PhaseIV Address [50.1] :
Volker.