[Bug 1335502] Re: Samba4 does not work with IPv6

[Thiago Martins]

Hey Seth,

I completely agree with you... If true, this problem is serious (and
unbelievable, it seems that Canonical have no Q.A. to deal with IPv6, or
something like that, I do not want to be rude, but make Ubuntu a better
O.S.) but, in the end of the day, I managed to make it work.

To make Samba4 safer against this problem (that come by default), we
need to provision the domain passing the following option: "--function-
level=2008_R2" to samba-tool.

Example with IPv6 working on Samba4 AD DC:

---
samba-tool domain provision --realm domain.com.br --domain DOMAIN --adminpass Test1234Lol --server-role=dc --use-rfc2307 --function-level=2008_R2
---


This way, Samba4 will behave okay when you have IPv6 on your network.


Samba4 AD DC with IPv6 enabled:

---
root at ubuntu-ad-1:~# host -t SRV _ldap._tcp.domain.com.br
_ldap._tcp.domain.com.br has SRV record 0 100 389 ubuntu-ad-1.domain.com.br.

root at ubuntu-ad-1:~# host ubuntu-ad-1.domain.com.br
ubuntu-ad-1.domain.com.br has address 192.168.1.221
ubuntu-ad-1.domain.com.br has IPv6 address 2008:xxx:200:3f6::10
---


Also, I noted that, 2008_R2 level do NOT fix this if you just tries to "raise up" your "Samba AD DC", after enabling IPv6, for example, by doing:

---
samba-tool domain level raise --domain-level 2008_R2 --forest-level 2008_R2
---

It will not fix the problem... You need to start from scratch, using
2008_R2 level from the beginning, to not hit this problem.

So, this is still a BUG but, less serious if you not use the "defaults"
to provision your domain at first...

Cheers!
Thiago

** Description changed:

  Hello guys,
  
  I'm playing with Samba4 and, with IPv4, it works great but, when we
  enable IPv6, nothing works.
  
  Here is how to reproduce it:
  
  Resume of the procedure that works (IPv4-Only):
  
  SOURCE: http://www.tiltingatlinux.com/2014/04/basic-samba4-domain-
  controler-on-ubuntu.html
  
  ---
  1- Install Ubuntu 14.04;
  
  2- Configure /etc/hosts & /etc/network/interfaces according;
  
  4- Install Samba4, like this: "apt-get install samba krb5-user
  smbclient";
  
  5- Provision domain with: "samba-tool domain provision --realm
  domain.com.br --domain DOMAIN --adminpass Test1234Lol --server-role=dc
  --use-rfc2307";
  
  6- Reboot & Done!
  ---
  
  Everything works as expected but, since my network is based on IPv6, I
  need to enable it in Samba and... It does not work...
  
  Resume of the procedure that does not work (Dual-Stacked):
  
  ---
  1- Install Ubuntu 14.04;
  
  2- Configure /etc/hosts & /etc/network/interfaces, like this:
  
  -----
  auto eth0
  
  iface eth0 inet6 static
   address 2008:xxx:200:3f6::10
   netmask 64
   gateway 2008:xxx:200:3f6::1
  
  iface eth0 inet static
   address 192.168.1.221
   netmask 24
   gateway 192.168.1.1
   dns-domain domain.com.br
   dns-search domain.com.br
   dns-nameservers 192.168.1.221
  
  -- hosts:
  
  127.0.0.1	localhost.localdomain	localhost
  2008:xxx:200:3f6::10   ubuntu-ad-1.domain.com.br	ubuntu-ad-1
- 192.168.15.221	ubuntu-ad-1.domain.com.br	ubuntu-ad-1
+ 192.168.1.221	ubuntu-ad-1.domain.com.br	ubuntu-ad-1
  -----
  
  4- Install Samba4, like this: "apt-get install samba krb5-user
  smbclient";
  
  5- Provision domain with: "samba-tool domain provision --realm
  domain.com.br --domain DOMAIN --adminpass Test1234Lol --server-role=dc
  --use-rfc2307";
  
  6- Reboot and... Nothing is working, Samba isn't listening on 53, 389, etc...
  ---
  
  Is there any workarounds to deal with it?
  
  Thanks!
  Thiago

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Title:
  Samba4 does not work with IPv6

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