cannot resolve hostname
Hello
In what seems to be a string of related issues having to do with 
networking, I now find that not only has my IP address been changed from 
192.168.1.40 to 192.168.1.64 but also that my machine's name (valhalla) 
cannot be resolved.
This is the output of ifconfig:
$ sudo ifconfig
sudo: unable to resolve host valhalla
eth0      Link encap:Ethernet  HWaddr 00:90:47:05:a3:07
          inet addr:192.168.1.64  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::290:47ff:fe05:a307/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:47117 errors:0 dropped:0 overruns:0 frame:0
          TX packets:46335 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:38194090 (36.4 MiB)  TX bytes:6237238 (5.9 MiB)
          Interrupt:18 Base address:0xec00
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:7309 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7309 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2964856 (2.8 MiB)  TX bytes:2964856 (2.8 MiB)
Any help would be appreciated in sorting this out, specifically:
(1) How do I fix my IP address so that it remains as I originally 
configured it (i.e. 192.168.1.40) which will make it easier and more 
predictable for the print client to find the server machine?
(2) How do I do so in such a way that I can access the Net once I reboot 
- which I was unable to do and hence - on good advice - changed the 
/etc/network/interfaces so that the stanza changed from iface eth0 inet 
*static* to *dhcp* .  This was the only thing that enabled this machine 
to access the Net after a reboot and I am loathe to change this back to 
something that didn't work.
(3) Helping me to understand how/ why all of these changes have taken 
place?  What happened?  I had a perfectly running system - everything 
worked, and then yesterday I rebooted and I find this dog's breakfast of 
an arrangement.
Thanks in anticipation, list.
AG
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