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mattbatt
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 Posted: Wed Jul 16, 2014 11:08 pm |
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Joined: Tue Aug 15, 2006 11:14 am
Posts: 1343
Location:
Orlando FL
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I seem to be the king of odd problems. DNS was working earlier today and then tonight I pulled up chrome and nothing was working. I did a " ping google.com" command and got a response of "unknown host". While poking around in some Arch forums I ran across someone suggesting to investigate resolv.conf. I checked it out and it said it was "generated by dhcpcd" so I ran Code: sudo dhcpcd and now everything is working again. BUT WHY? How in the Wide wide world of sports did I screw this up?! _________________ My System
Last edited by mattbatt on Sat Jul 26, 2014 10:05 pm, edited 1 time in total.
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mattbatt
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Posted: Thu Jul 17, 2014 6:50 pm |
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Joined: Tue Aug 15, 2006 11:14 am
Posts: 1343
Location:
Orlando FL
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I had to do it again tonight to make the internet work.
_________________ My System
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jams
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Posted: Mon Jul 21, 2014 8:40 am |
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Joined: Fri Jun 11, 2004 7:58 am
Posts: 507
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blindly running dhcpcd is in general a bad idea, especially if your not using dhcp to obtain the ip address.
I think the first thing todo would be to look at the contents of /etc/resolv.conf. Are there other lines then the "generated by" one?
It's possible the lease on the ip ran out and dhcp messed up the renew somehow.
Also to restart network run /etc/net/scripts/network.init stop|start
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mattbatt
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Posted: Mon Jul 21, 2014 9:15 pm |
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Joined: Tue Aug 15, 2006 11:14 am
Posts: 1343
Location:
Orlando FL
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So I've been running "sudo dhcpcd" every time I reboot to make DNS work. What really doesn't make sense is that my MythBox has a static address and that is set up in the LinHES->Network menu. My router knows to assign MythTV a specific address. Here is what "/etc/resolv.conf" says right after reboot. Restarting etc/net/scripts/network.init didn't change anything. Code: GNU nano 2.2.6 File: /etc/resolv.conf
# Generated by dhcpcd
search local
# /etc/resolv.conf.tail can replace this line
and this is what it says after running "sudo dhcpcd" Code: GNU nano 2.2.6 File: /etc/resolv.conf
# Generated by dhcpcd from eth0
search local
domain lan
nameserver 192.168.0.1
# /etc/resolv.conf.tail can replace this line
Thanks Jams for your help _________________ My System
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jams
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Posted: Tue Jul 22, 2014 7:46 am |
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Joined: Fri Jun 11, 2004 7:58 am
Posts: 507
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What are the contents of:
/etc/net/ifaces/eth0/options
&
/etc/systemconfig
Feel free to email them to me if you don't what it public.
Assuming that eth0 is the interface in question
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slowtolearn
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Posted: Tue Jul 22, 2014 2:12 pm |
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Joined: Wed Nov 16, 2005 8:55 pm
Posts: 1381
Location:
Farmington, MI USA
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mattbatt wrote: So I've been running "sudo dhcpcd" every time I reboot to make DNS work. What really doesn't make sense is that my MythBox has a static address and that is set up in the LinHES->Network menu. If true, then this is your problem and you would have to manually place the appropriate entries into your resolv.conf (and perhaps others) file. A system with a truly static IP address wouldn't need to run a DHCP client. mattbatt wrote: My router knows to assign MythTV a specific address. This is where the confusion starts. A static IP assignment is defined on the device itself, in this case your Myth box. A DHCP reservation - Where a DHCP server assigns a specific IP address to a device based on it's MAC address - is not a static IP address (although many refer to this as a "static DHCP address", still (more or less) technically incorrect). So, if your Myth box is truly set for a static address and you don't update the resolv.conf file, it doesn't know what name servers (DNS) to use. Once you run the DHCP client that information is populated by the info sent from your router. You'll have to decide if the system is to have a true static address (doesn't run dhcpcd) or one reserved for it from the DHCP pool. I don't run any Arch-based systems but I bet the other files that may need looking into are those that Jams mentioned  Scott
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RacerX
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Posted: Wed Jul 23, 2014 7:48 am |
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Joined: Sun Sep 05, 2004 7:06 pm
Posts: 690
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Back in the day I use to have an pci intel nic in my box and it would do that business can't find google and then I had to restart the service and it would work. I noticed that if when I installed if I would make a make in the ip address transpose or the network was having issues it would not be able to resolve and it would let me continue the install. Then I had to start digging with the resolve.cfg and it would eventually work. More recently I started using Mythwelcome so I changed my setup to use dhcp service from my router. I created a pool on the router for exactly the number of machines in my network and now it works perfect for the past year.....
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mattbatt
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Posted: Wed Jul 23, 2014 9:40 pm |
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Joined: Tue Aug 15, 2006 11:14 am
Posts: 1343
Location:
Orlando FL
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Code: [mythtv@gimli ~]$ sudo nano /etc/net/ifaces/eth0/options
GNU nano 2.2.6 File: /etc/net/ifaces/eth0/options
# If you want to change current interface name, edit /etc/net/iftab,
# rename current directory and uncomment this line:
TYPE=eth
DISABLED=no
BOOTPROTO=static
ONBOOT=yes
CONFIG_WIRELESS=no
WOW that was a close one I almost posted my password on the world wide web. Ya should warn a guy next time!!!  Code:
# Language
#-----------------------------
language="EN_US"
# Hostype
#-----------------------------
SystemType="Master_backend"
dbhost=192.168.0.164
RunFrontend="1"
UseMythWelcome="0"
# Network config
#-----------------------------
hostname="gimli"
default_interface="eth0"
# Network config for eth0
#-----------------------------
Hostipeth0="192.168.0.164"
Hostnetmasketh0="/24 255.255.255.0"
HostDNSeth0="192.168.0.1"
HostUSEDHCPeth0="1"
HostGWeth0="192.168.0.1"
HostActiveeth0="1"
HostESSIDeth0=""
HostUseEncryptioneth0=""
HostKeyeth0=""
HOST_iswirelesseth0="0"
HostMTUeth0=""
# Misc
#-----------------------------
timezone="America/New_York"
Hostupdateplan="All"
ShowTips="1"
# Advanced
#-----------------------------
bewait="0"
ncidclient="0"
Runncidd="0"
nciddSerialPort="ttyS0"
nciddDeviceNetCallerID="0"
Usebootsplash="0"
RemoteBackup="0"
RemoteBackupDir="shadowfax"
RunDHCP="0"
UseMythWEB="1"
# fileshare
#-----------------------------
UseSamba="1"
Samba_media="1"
Samba_mediareadonly="0"
Samba_home="1"
Samba_homereadonly="0"
Samba_domain="WORKGROUP"
UseNFS="1"
HaveCentralNFS="no"
NFSserver="file:nfsmap"
NFSmount="/myth"
CentralNFSallhosts="1"
# sleep
#-----------------------------
AutoShutdown="0"
Shutdowntime="2"
Shutdowntime2="2"
# X display settings
#-----------------------------
XIgnoreConfig="1"
Xcardtype=""
XUseAdvanced=""
Xres="1920x1080"
UseXLargeMouse="0"
# Audio settings
#-----------------------------
Audiotype="ALSA"
Audiotypeout="Analog"
SoundDevice="hw:1,9"
# Software settings
#-----------------------------
mytharchive="0"
mythbrowser="0"
mythnetvision="1"
mythgallery="1"
mythgame="0"
mythmusic="1"
mythnews="0"
mythzoneminder="0"
mythweather="0"
#-----------------------------
romdb="1"
snes9x="0"
fceux="0"
mame="1"
mednafen="0"
mupen64="0"
dolphinemu="0"
xe="1"
#-----------------------------
dvdcss="1"
mythappletrailers="1"
miro="0"
webonlinhes="0"
huludesktop="1"
foldingathome="0"
foldingusername=""
foldingworksize="big"
# ddns settings
#-----------------------------
DDnslogin=""
DDnspassword=""
DDnshostname=""
DDnsEnable="0"
# screensaver settings
#-----------------------------
Screensavertype="none"
Screensaveridle="5"
Screensavertheme=""
# IR settings
#-----------------------------
Remotetype="streamzap"
Remotebucket="favorites"
ReceiverType="streamzap"
HDHRlirc_device="1012BFEE"
HostLircWait=""
ReceiverSerialport="ttyS0"
HostTransmitproto_1="none"
HostTransmitproto_2="none"
HostTransmitproto_3="none"
HostTransmitproto_4="none"
HostTransmitDelay_1=""
HostTransmitDelay_2=""
HostTransmitDelay_3=""
HostTransmitDelay_4=""
HostBlasterType="None"
HostSerialPort_blasterlirc="ttyS0"
Hostnumblaster="1"
LCDtype="no_lcd"
# user settings
#-----------------------------
rootSSH="0"
# Supplemental
#-----------------------------
supplemental="1"
windowmanager="enlightenment"
EnhancedWMStyle="1"
# VNC
#-----------------------------
vncenable="1"
vncpassword="**********"
xvncenable="1"
xvncpassword="************"
# webuser
#-----------------------------
UseMythWEB_auth="1"
_________________ My System
Last edited by mattbatt on Wed Jul 23, 2014 10:07 pm, edited 1 time in total.
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mattbatt
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Posted: Wed Jul 23, 2014 9:56 pm |
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Joined: Tue Aug 15, 2006 11:14 am
Posts: 1343
Location:
Orlando FL
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@slowtolearn Yes that is what is confusing me as well the router is reserving 192.168.0.164 for my NIC's MAC address and I have MythTV set (in the settings at least) to static 192.168.0.164 and to look at 192.168.0.1 for DNS requests. I've thought about changing that to 8.8.8.8 or one of OpenDNS's address, I'm just not sure how to add a second (redunat backup) if the first DNS cache is down. Here is a screen capture of my network settings page. BTW big thanks Admins for adding XVNC to the standard LinHES install it has proven useful in situations like this. https://www.dropbox.com/s/5i8drb17zfq6g ... ttings.jpg_________________ My System
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alien
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Posted: Thu Jul 24, 2014 2:35 am |
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Joined: Mon Jun 21, 2004 5:28 am
Posts: 700
Location:
Germany
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mattbatt wrote: Yes that is what is confusing me as well the router is reserving 192.168.0.164 for my NIC's MAC address and I have MythTV set (in the settings at least) to static 192.168.0.164 and to look at 192.168.0.1 for DNS requests. I've thought about changing that to 8.8.8.8 or one of OpenDNS's address, I'm just not sure how to add a second (redunat backup) if the first DNS cache is down. Hi mattbatt, You have already configured the router to give the mythtv box 192.168.0.164. It would probably be easier to configure the mythtv box for dynamic IP and let DHCP do the rest. The router will give the mythbox the desired IP (192.168.0.164) plus all the required DNS, next-hop, etc.
_________________
ASUS AT3N7A-I (Atom 330)
TBS 8922 PCI (DVB-S2)
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slowtolearn
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Posted: Thu Jul 24, 2014 6:54 am |
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Joined: Wed Nov 16, 2005 8:55 pm
Posts: 1381
Location:
Farmington, MI USA
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mattbatt wrote: Yes that is what is confusing me as well the router is reserving 192.168.0.164 for my NIC's MAC address and I have MythTV set (in the settings at least) to static 192.168.0.164 and to look at 192.168.0.1 for DNS requests. I've thought about changing that to 8.8.8.8 or one of OpenDNS's address, I'm just not sure how to add a second (redunat backup) if the first DNS cache is down. You need to choose either static or DHCP. Right now your setup is (sort of) both. With BOOTPROTO set to static your myth box won't start dhcpcd automagically. alien wrote: Hi mattbatt,
You have already configured the router to give the mythtv box 192.168.0.164. It would probably be easier to configure the mythtv box for dynamic IP and let DHCP do the rest. The router will give the mythbox the desired IP (192.168.0.164) plus all the required DNS, next-hop, etc. ^^ This
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mattbatt
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Posted: Thu Jul 24, 2014 9:31 pm |
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Joined: Tue Aug 15, 2006 11:14 am
Posts: 1343
Location:
Orlando FL
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Quote: You need to choose either static or DHCP. Right now your setup is (sort of) both. With BOOTPROTO set to static your myth box won't start dhcpcd automagically. I guess what I'm confused about is why I have to run dhcpcd at all? I literally just replaced the computer last month, It's the same router the same IP same settings and now it's not working. Sure I can set it to DHCP that's an adequate band-aid but I was trying to figure out where I went wrong. Thanks for the help guys. _________________ My System
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RacerX
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Posted: Fri Jul 25, 2014 6:19 am |
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Joined: Sun Sep 05, 2004 7:06 pm
Posts: 690
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Dhcp service is easier to manage. Typically servers and printers have static ips and the computers get put into the dhcp pool. When you have a large network it's a impossible to have to remember all the ips so you do not have a conflict. Dhcp can run on a server or a router. Sometimes the router stores the mac address of the nic. It you replace the device (ie new nic) the mac might need to be removed and then recreate the device.....
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slowtolearn
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Posted: Fri Jul 25, 2014 6:53 am |
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Joined: Wed Nov 16, 2005 8:55 pm
Posts: 1381
Location:
Farmington, MI USA
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mattbatt wrote: I guess what I'm confused about is why I have to run dhcpcd at all? You don't. But you have to choose one or the other, and adjust settings based on that decision. mattbatt wrote: Sure I can set it to DHCP that's an adequate band-aid but I was trying to figure out where I went wrong. It's not a bandaid at all, it's one standard option. Where you went wrong was setting it for static, but not providing the necessary information for DNS servers in your resolv.conf (if you want it to have a static IP), or setting it for static when you really want it to use DHCP and let the DHCP server provide all the necessary information. It's an either-or choice. Since you already have the router set to provide the myth box a certain IP address, seems the easiest thing would be to let DHCP do it's job. If you choose to go with a static address make sure it's not within your DHCP range.
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jams
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Posted: Sat Jul 26, 2014 1:11 pm |
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Joined: Fri Jun 11, 2004 7:58 am
Posts: 507
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Mattbatt,
looks like things are setup correctly, but by running dhcpcd it has messed up the settings for resolv.conf.
run:
sudo systemconfig.py -m network
and it should fix it up for you.
To verify look at /etc/resolv.conf to make sure the correct values are present.
Also make sure that dhcpcd is not running on the system, otherwise it will continue to muck up that file.
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