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vitoriung
Apprentice
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Joined: 21 May 2007
Posts: 158
Location: Prague, Czech Republic

PostPosted: Fri Mar 26, 2010 6:26 pm    Post subject: Linux DNS and MX in "Windows" environment Reply with quote

Hi,
I am fighting with this few days already, but cannot find any solution.

I need to setup my Linux clients so I can ping and resolve names in our internal domain, lets say mycompany.net

It works fine on Windows client; just set Primary DNS suffix mycompany.net in "Computer name changes" and computer gets a FQDN and is capable to recieve emails from outside world to name@mywinxp.mycompany.net
It works using both DHCP or static IP:
Code:

C:\ipconfig /all

Windows IP Configuration

        Host Name . . . . . . . . . . . . : mywinxp
        Primary Dns Suffix  . . . . . . . : mycompany.net
        Node Type . . . . . . . . . . . . : Hybrid
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : mycompany.net
                                           mycompany.net

Ethernet adapter Local Area Connection:

        Connection-specific DNS Suffix  . : mycompany.net
        Description . . . . . . . . . . . : Intel(R) 82566DM Gigabit Network Connection
        Physical Address. . . . . . . . . : 00-21-5A-C2-72-F8
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 10.128.11.44
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 10.128.11.1
        DHCP Server . . . . . . . . . . . : 10.128.100.90
        DNS Servers . . . . . . . . . . . : 10.128.100.25
                                                    10.128.100.26
                                                    10.130.100.100
        Primary WINS Server . . . . . . . : 10.128.100.25
        Lease Obtained. . . . . . . . . . : 26 March 2010 03:26:54
        Lease Expires . . . . . . . . . . : 27 March 2010 03:26:54

C:\nslookup mywinxp
*** Can't find server name for address 10.128.100.25: Non-existent domain
*** Can't find server name for address 10.128.100.26: No response from server
*** Can't find server name for address 10.130.100.100: Non-existent domain
*** Default servers are not available
Server:  UnKnown
Address:  10.128.100.25

Name:    mywinxp.mycompany.net
Address:  10.128.11.44


In Linux got so far:

My settings are:
Code:

/etc/conf.d/net
bridge_br0="eth0 tap0 tap1"
brctl_br0=( "setfd 0" "sethello 0" "stp off" )
rc_need_br0="net.tap0 net.tap1"
config_br0="dhcp"
dns_domain_br0="mydomain.net"
dns_search_br0="mydomain.net"

/etc/resolv.conf
# Generated by resolvconf
search mydomain.net
nameserver 10.128.100.25
nameserver 10.128.100.26
nameserver 10.130.100.100

/etc/samba/smb.conf
workgroup = workgroup
netbios name = sablnx64
wins server = 10.128.100.25
dns proxy = yes
map to guest = bad user
security = user
encrypt passwords = yes
smb passwd file = /etc/samba/private/smbpasswd
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192


I can ping sablnx64 from Windows client, but not sablnx64.mycompany.net
From sablnx64 I can ping all Windows clients and their FQDN, but cannot resolve the name from linux to linux.

What could I be missing in my configuration?
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bombcar
Guru
Guru


Joined: 08 Apr 2003
Posts: 446
Location: Lincoln Acres, CA

PostPosted: Sun Mar 28, 2010 11:02 pm    Post subject: Reply with quote

You're trying to get your Linux box to talk to the DHCP server such as to automatically update the dynamic DNS?

I've never got it to work, but by default my logs show that it seems to try.
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disi
Veteran
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Joined: 28 Nov 2003
Posts: 1354
Location: Out There ...

PostPosted: Mon Mar 29, 2010 12:14 pm    Post subject: Reply with quote

I am not sure, if I understand. You want the clients to append the domain and then do netbios? Try to turn off netbios over tcp/ip on the windows clients and see if they can still ping each other...

Is there a proper dns server for the domain?

Usually you would assign the domain-suffix to the clients via dhcp and then the dhcp updates the zone on the dns server. The clients then use the dns server toresolve the hostnames for other clients.

//edit: here is a nice howto on Gentoo wiki
dhcp: http://en.gentoo-wiki.com/wiki/DHCP
bind: http://en.gentoo-wiki.com/wiki/Bind
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vitoriung
Apprentice
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Joined: 21 May 2007
Posts: 158
Location: Prague, Czech Republic

PostPosted: Mon Jun 21, 2010 3:13 pm    Post subject: Reply with quote

disi wrote:
I am not sure, if I understand. You want the clients to append the domain and then do netbios? Try to turn off netbios over tcp/ip on the windows clients and see if they can still ping each other...

Is there a proper dns server for the domain?

Usually you would assign the domain-suffix to the clients via dhcp and then the dhcp updates the zone on the dns server. The clients then use the dns server toresolve the hostnames for other clients.

//edit: here is a nice howto on Gentoo wiki
dhcp: http://en.gentoo-wiki.com/wiki/DHCP
bind: http://en.gentoo-wiki.com/wiki/Bind


I tried to disable netbios over tcp, renamed Win client and restarted, computer name cannot be found on the network even though it got assigned WINS server IP from DHCP.
Enabling Netbios allows ping both computer and computer.mycompany.net straight away.

So I have to setup Netbios option somewhere, so far I found I can set this in dhcpd or nmbd, but these are server solutions, my linux box is just client in mycompany.net, so I don't want run any services like DHCP server.
However maybe nmbd could do the job for this?

I didn't reply for a while because I am workarounding this using virtual Windows server used as a SMTP server forwarding emails to my linux mail servers, but I'd like to find the resolution, so my Linux servers will be able to receive emails straight from our main email gateway.
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