Hello
I happen to have two network interfaces on my new, up-to-date, CentOS 6.2, named eth0 and virbr0 (3 of them if I include the lo interface).
However the system APIs like getaddrinfo() only return the address for the virbr0 interface (which was created by the CentOS installation), when I would like to have them both.
Even if I give the configured eth0 address explicitly to getnameinfo(), it can not perform the reverse lookup to my hostname, and returns a string with the same numeric IP address given as argument. I also can not get the list of samba name aliases for my host name.
I can happily ping my host from a different computer on the eth0 network, so the nmb service binds on eth0 and works as expected.
I have installed and configured smb, nmb and winbind services, and I have added 'wins' to /etc/nsswitch.conf, so my hosts line there looks like: hosts: files wins mdns4_minimal [NOTFOUND=return] dns
Is there something I should do for wins name service to return all IP addresses ?
Are there some similar settings that I need to do in order to get the reverse lookup to work ?
For reference here are my system information and application output, as follows.
Here are my interfaces: [adrian@adrian projects]$ ifconfig eth0 Link encap:Ethernet HWaddr 00:1C:C0:DA:63:75 inet addr:10.0.0.154 Bcast:10.255.255.255 Mask:255.0.0.0 inet6 addr: fe80::21c:c0ff:feda:6375/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1222539 errors:0 dropped:0 overruns:0 frame:0 TX packets:708669 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1491421614 (1.3 GiB) TX bytes:136206085 (129.8 MiB) Interrupt:20 Memory:d0600000-d0620000
lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:751048 errors:0 dropped:0 overruns:0 frame:0 TX packets:751048 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:208785657 (199.1 MiB) TX bytes:208785657 (199.1 MiB)
virbr0 Link encap:Ethernet HWaddr 52:54:00:92:B0:1A inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:4038 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:393067 (383.8 KiB)
And here is how my applications behave: [adrian@adrian projects]$ python Python 2.6.6 (r266:84292, Dec 7 2011, 20:48:22) [GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] on linux2 Type "help", "copyright", "credits" or "license" for more information.
import socket socket.gethostbyname_ex('adrian')
('adrian', [], ['192.168.122.1'])
for a in socket.getaddrinfo('adrian', None, 0, 0, 0,
socket.AI_CANONNAME) : ... print a ... (2, 1, 6, 'adrian', ('192.168.122.1', 0)) (2, 2, 17, '', ('192.168.122.1', 0)) (2, 3, 0, '', ('192.168.122.1', 0))
[adrian@adrian projects]$
As you can see there are no name aliases returned, and there is only one IP address given for my host name.
You can see my samba name aliases here: [adrian@adrian projects]$ nmblookup -A -T 10.0.0.154 Looking up status of 10.0.0.154 ADRIAN <00> - B <ACTIVE> ADRIAN <03> - B <ACTIVE> ADRIAN <20> - B <ACTIVE> ..__MSBROWSE__. <01> - <GROUP> B <ACTIVE> TERMINATORUL <00> - B <ACTIVE> TERMINATORUL <03> - B <ACTIVE> TERMINATORUL <20> - B <ACTIVE> TIMOTHY <00> - B <ACTIVE> TIMOTHY <03> - B <ACTIVE> TIMOTHY <20> - B <ACTIVE> TOUGHY <00> - B <ACTIVE> TOUGHY <03> - B <ACTIVE> TOUGHY <20> - B <ACTIVE> WORKGROUP <1d> - B <ACTIVE> WORKGROUP <1e> - <GROUP> B <ACTIVE> WORKGROUP <00> - <GROUP> B <ACTIVE>
MAC Address = 00-00-00-00-00-00
(namely adrian, terminatorul, timothy, toughy). Trying to resolve my hostname to an IP address with nmblookup also returns just one of the IP addresses:
[adrian@adrian projects]$ nmblookup adrian querying adrian on 192.168.122.255 192.168.122.1 adrian<00> [adrian@adrian projects]$