LAN failover device doesn't appear to work

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wademj
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LAN failover device doesn't appear to work

Post by wademj » Thu Apr 27, 2023 1:40 am

I have a E9.2-1 (FT) system running under VirtualBox. First build was with a simple EIA0 configured in TCPIP as IE0 and all worked as expected. Then I tried to switch this to a failover device.

MC LANCP DEFINE LLA0 /FAIL=EIA0 /ENAB

<reboot>

From console, stop TCPIP (SYS$STARTUP:TCPIP$SHUTDOWN) and then use TCPIP$CONFIG to remove IP address from IE0 and reconfigure under LL0.

<reboot>

Has always worked for me in the past and yes, the LLA0 device is "up" with the EIA device also showing as "up" and "active". But no comms. Ping out to default gateway no working, same for inbound.

Reverse procedure back to original EIA0 and IE0 combination and it's all working again.

Am I missing something? Have always set this up so underlying device name changes can be easily fixed without reconfiguring DECnet (back in the day), TCPIP, LAT etc.
Malcolm

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volkerhalle
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Re: LAN failover device doesn't appear to work

Post by volkerhalle » Thu Apr 27, 2023 2:00 am

wademj,

works for me (on VMware Workstation Player 16.2.3 using VMnet8 as network device).

Code: Select all

VOLKER $ ucx ping 192.168.199.2
PING 192.168.199.2 (192.168.199.2): 56 data bytes
64 bytes from 192.168.199.2: icmp_seq=0 ttl=128 time=0 ms
64 bytes from 192.168.199.2: icmp_seq=1 ttl=128 time=0 ms
64 bytes from 192.168.199.2: icmp_seq=2 ttl=128 time=0 ms
64 bytes from 192.168.199.2: icmp_seq=3 ttl=128 time=0 ms


----192.168.199.2 PING Statistics----
4 packets transmitted, 4 packets received, 0% packet loss
round-trip (ms)  min/avg/max = 0/0/0 ms
VOLKER $ ucx sho int
                                                           Packets
Interface   IP_Addr         Network mask          Receive          Send     MTU

 LE0        192.168.199.192 255.255.255.0              21            22    1500
 LO0        127.0.0.1       255.0.0.0                   5             5    4096
Volker.

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m_detommaso
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Re: LAN failover device doesn't appear to work

Post by m_detommaso » Thu Apr 27, 2023 3:08 am

VirtualBox network adapter "Promiscuous Mode" setting is required when you configure Lan Failover device LLxx.

For more technical details refer to viewtopic.php?f=9&t=8593#p18027


vms_lla.PNG


/Maurizio

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imiller
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Re: LAN failover device doesn't appear to work

Post by imiller » Thu Apr 27, 2023 4:27 am

VirtualBox Network Promiscuous mode 'Allow VM' also seems to work.
As DECnet IV addressing and LAN failover sets both add MAC addresses then it makes sense that some way of receiving data to multiple MAC addresses is required,
Ian Miller
[ personal opinion only. usual disclaimers apply. Do not taunt happy fun ball ].


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wademj
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Re: LAN failover device doesn't appear to work

Post by wademj » Thu Apr 27, 2023 5:11 pm

Thanks Maurizio; that fixed it!

Malcolm
Malcolm

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