I have created an ticket to track it. https://github.com/pmodels/mpich/issues/2889 Yanfei Guo Assistant Computer Scientist MCS Division, ANL On 12/6/17, 11:52 AM, "Shuwei Zhao" <[email protected]> wrote: Are you going to use getaddrinfo instead to deprecate gethostbyname? Thanks On Wed, 6 Dec 2017 at 11:50 Guo, Yanfei <[email protected]> wrote: Hi Shuwei, The communication over IPv6 network is supported as long as the lower-level network library supports it. However, MPICH uses gethostbyname to translate hostnames to addresses in order to initialize the link which is not working on pure IPv6. Yanfei Guo Assistant Computer Scientist MCS Division, ANL On 12/6/17, 11:46 AM, "Shuwei Zhao" <[email protected]> wrote: Hi Yanfei， I ask this question months ago，but I was told IPv6 is supported in mpich 3.*. So it's not supported? Thanks Shuwei On Wed, 6 Dec 2017 at 11:24 Guo, Yanfei <[email protected]> wrote: Hi Carlos, MPICH currently uses gethostbyname which does not support IPv6, therefore it won’t work on a pure IPv6 network. Best, Yanfei Guo Assistant Computer Scientist MCS Division, ANL On 11/22/17, 2:23 PM, "Carlos" <[email protected]> wrote: Is it possible to use mpich (3.3) with IPv6-only? We tried it here and got Fatal error in MPI_Init: Other MPI error, error stack: MPIR_Init_thread(506)..............: MPID_Init(211).....................: channel initialization failed MPIDI_CH3_Init(89).................: MPID_nem_init(324).................: MPID_nem_tcp_init(178).............: MPID_nem_tcp_get_business_card(425): ckpt_restart(384)..................: gethostbyname failed, zuratkul (errno 4) ************* This shows that mpich doesn't run without IPv4, which is our case... Is there a way to make it work in this situation? _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss