[Bug 1344400] Re: samba-tool tries to use IPv6 for Secondary DC, even if host doesn't have it, but Primary DC have IPv6 (Dual-Stacked).

Thiago Martins thiagocmartinsc at gmail.com
Fri Jul 18 22:46:22 UTC 2014


** Description changed:

  Guys,
  
  I'm facing this problem too:
  https://lists.samba.org/archive/samba/2013-March/172230.html
  
  NOTE: I just posted this message on Samba maillist but, this seems to be
  a BUG, so, I'm opening it here too.
  
+ ---
+ The problem is:
  
- The problem is: samba-tool must use IPv6 ONLY IF the machine have IPv6.
+ * samba-tool must use IPv6 ONLY IF the machine have IPv6.
+ * samba-tool must be able to join a IPv4-Only Secondary DC, into a Dual-Stacked "Samba4 AC DC".
+ ---
  
- 
- I have two Samba4 AC DC, in both located in my office, dual-stacked, working like a charm.
+ I have two Samba4 AC DC, in both located in my office, dual-stacked,
+ working like a charm.
  
  Now, I need to deploy a third DC, located within Amazon EC2, which does
  NOT have IPv6.
  
  But, samba-tool fails to join.
  
  How can I workaround this, without enabling a tunneled IPv6 within my
  EC2 ?
  
  Exemplifying:
  
  1- ubuntu-ad-1 - Master - ok - office LAN1 - IPv4 / IPv6
  2- ubuntu-ad-2 - Slave - ok - office LAN2 - IPv4 / IPv6
  
  3- ubuntu-ad-3 - Slave can't join - AWS - IPv4-Only
  
  ---
  root at ubuntu-ad-3:~# kinit administrator
- Password for administrator at CENTRAL.DOMAIN.COM.BR: 
+ Password for administrator at CENTRAL.DOMAIN.COM.BR:
  Warning: Your password will expire in 40 days on Thu 28 Aug 2014 05:56:10 PM UTC
  ---
  
  ---
  root at ubuntu-ad-3:~# samba-tool domain join central.domain.com.br DC -Uadministrator --realm=CENTRAL.DOMAIN.COM.BR --dns-backend=BIND9_DLZ
  Finding a writeable DC for domain 'central.domain.com.br'
  ERROR(exception): uncaught exception - Failed to find a writeable DC for domain 'central.domain.com.br'
-   File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in _run
-     return self.run(*args, **kwargs)
-   File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 552, in run
-     machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
-   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 1150, in join_DC
-     machinepass, use_ntvfs, dns_backend, promote_existing)
-   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 76, in __init__
-     ctx.server = ctx.find_dc(domain)
-   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 262, in find_dc
-     raise Exception("Failed to find a writeable DC for domain '%s'" % domain)
+   File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in _run
+     return self.run(*args, **kwargs)
+   File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 552, in run
+     machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
+   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 1150, in join_DC
+     machinepass, use_ntvfs, dns_backend, promote_existing)
+   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 76, in __init__
+     ctx.server = ctx.find_dc(domain)
+   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 262, in find_dc
+     raise Exception("Failed to find a writeable DC for domain '%s'" % domain)
  ---
  
  Debugging it with `strace`, I'm seeing:
  
  ---
  strace -f -e trace=network samba-tool domain join CENTRAL.DOMAIN.COM.BR DC -Uadministrator --realm=CENTRAL.DOMAIN.COM.BR --dns-backend=BIND9_DLZ
  .....
  [pid  1533] +++ killed by SIGKILL +++
  --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=1533, si_status=SIGKILL, si_utime=0, si_stime=0} ---
  socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = 5
  setsockopt(5, SOL_IPV6, IPV6_V6ONLY, [1], 4) = 0
  connect(5, {sa_family=AF_INET6, sin6_port=htons(389), inet_pton(AF_INET6, "2001:1291:XXX:85Xa::66XX", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 ENETUNREACH (Network is unreachable)
  ERROR(exception): uncaught exception - Failed to find a writeable DC for domain 'CENTRAL.DOMAIN.COM.BR'
-   File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in _run
-     return self.run(*args, **kwargs)
-   File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 552, in run
-     machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
-   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 1150, in join_DC
-     machinepass, use_ntvfs, dns_backend, promote_existing)
-   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 76, in __init__
-     ctx.server = ctx.find_dc(domain)
-   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 262, in find_dc
-     raise Exception("Failed to find a writeable DC for domain '%s'" % domain)
+   File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in _run
+     return self.run(*args, **kwargs)
+   File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 552, in run
+     machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
+   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 1150, in join_DC
+     machinepass, use_ntvfs, dns_backend, promote_existing)
+   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 76, in __init__
+     ctx.server = ctx.find_dc(domain)
+   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 262, in find_dc
+     raise Exception("Failed to find a writeable DC for domain '%s'" % domain)
  +++ exited with 255 +++
  ---
  
  So, how can I force samba-tool to use IPv4? Since ubuntu-ad-3 doesn't
  have IPv6...
  
  Thanks!
  Thiago

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https://bugs.launchpad.net/bugs/1344400

Title:
  samba-tool tries to use IPv6 for Secondary DC, even if host doesn't
  have it, but Primary DC have IPv6 (Dual-Stacked).

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