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 LSF NIOS not listening on IPv6

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Ruochong Fan's profile image
Ruochong Fan posted Mon March 24, 2025 12:23 AM

I have a question regarding the conditions required for the LSF NIOS process to listen on IPv6 (aside from setting LSF_ENABLE_SUPPORT_IPV6=Y).

When I submit interactive jobs from a dual-stack client host to an IPv6-only server, the job exits with code 255. Using tcpdump and netstat, I observed that the nios process on the client node is only listening on IPv4, despite IPv6 being enabled (LSF_ENABLE_SUPPORT_IPV6=Y). As a result, the IPv6-only execution server fails to connect to nios on the submitting client. However, I was able to execute interactive jobs on the same server when submitting from an IPv6-only client.

I verified the value of LSF_ENABLE_SUPPORT_IPV6 using badmin showconf, which confirms that LSF_ENABLE_SUPPORT_IPV6=Y.
LSF_DUALSTACK_PREFER_IPV6 is set to N because we prefer using IPv4 where possible.

What could be preventing nios on the dual-stack client from listening on IPv6?

YI SUN's profile image
YI SUN posted Tue April 01, 2025 07:39 PM  Best Answer

In that sense, you may consider to change the setting of LSF_DUALSACK_PREFER_IPV6 for this cluster.

YI SUN's profile image
YI SUN posted Thu March 27, 2025 04:52 PM

In your cluster, do all server nodes have IPv6 only and/or dual stack? When enable IPv6, any node in the cluster cannot have IPv4 only. 

Ruochong Fan's profile image
Ruochong Fan posted Tue April 01, 2025 02:00 AM

Hi, @YI SUN, thank you for replying.

No, there aren't any IPv4-only servers in the cluster. All servers are either IPv6-only or dual-stack.

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