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benneque
Tux's lil' helper
Joined: 01 Dec 2007
Posts: 134
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 Posted: Mon Oct 04, 2010 5:19 pm Post subject: (open)resolv.conf, DNS and networkmanager? |
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Hey,
I have ~amd64, KDE 4.5.1, knetworkmanager-9999 and networkmanager-0.8.1 installed.
Following questions:
Where can I see which DNS server I am using? Is it /etc/resolv.conf?
Now I have/had the following problem:
without openresolv useflag in networkmanager I set in knetworkmanager DNS server 8.8.8.8 but in /etc/resolv.conf nothing changend, even after resboot...
with operesolv useflag the DNS server entry was written to /etc/resolv.conf
That's ok ... I hope  Tell me!
But now why the hell there is another entry for 192.168.1.1 (my router), I have no entry for that in knetworkmanager ? Using the router as DNS is damn slow!!!
Now the strange thing is: My girlfriend has the same system as me (just a different notebook, and hers is compiled with gcc 4.4 and mine with 4.5) aaaand...
... same config (DNS 8.8.8. in knetworkmanager and in my girlfriends resolv.conf there's no entry for 192.168.1.1 . That's so stupid!
Another question: What is this DNS search thing for? I have an entry for "localdomain" , my girlfriend hasn't. Should I insert there the 8.8.8.8 as well? Or is it stupid?[/code]
Soo.. how can I see where the resolv.conf entrys come from? And how can I change them?
I tried one time to change the entrys by hand inside the file, this broke my ENTIRE network connection (wlan and eth) 
appendix:
my resolv.conf
| Code: | # Generated by resolvconf
search localdomain 8.8.4.4 8.8.8.8
nameserver 192.168.1.1
nameserver 8.8.4.4
nameserver 8.8.8.8 |
girlfriends resolv.conf
| Code: | # Generated by resolvconf
search 8.8.4.4 8.8.8.8
nameserver 8.8.4.4
nameserver 8.8.8.8 |
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UberLord
Retired Dev
Joined: 18 Sep 2003
Posts: 6835
Location: Blighty
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| Posted: Tue Oct 05, 2010 8:57 am Post subject: Re: (open)resolv.conf, DNS and networkmanager? |
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| benneque wrote: | | Another question: What is this DNS search thing for? I have an entry for "localdomain" , my girlfriend hasn't. Should I insert there the 8.8.8.8 as well? Or is it stupid? |
DNS search (and domain) is used to make name lookup easier
| Code: | | search foo.com bar.org |
You could then ping wibble, and it would try wibble.foo.com and then wibble.bar.org.
domain is like search, but only accepts one item.
See reslolv.conf(5) for details.
| Quote: | Soo.. how can I see where the resolv.conf entrys come from? And how can I change them?
I tried one time to change the entrys by hand inside the file, this broke my ENTIRE network connection (wlan and eth)
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resolvconf -l
will show you the individual resolv.conf files given to it. Hopefully a comment at the top will show you from where it came.
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benneque
Tux's lil' helper
Joined: 01 Dec 2007
Posts: 134
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| Posted: Tue Oct 05, 2010 11:43 am Post subject: |
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resolvconf -l says:
| Code: | # resolv.conf from NetworkManager
# Generated by NetworkManager
search 8.8.4.4 8.8.8.8
nameserver 8.8.4.4
nameserver 8.8.8.8
# resolv.conf from wlan0
# Generated by dhcpcd from wlan0
domain localdomain
nameserver 192.168.1.1 |
so the damn dhcpcd is it! But it's in no runlevel.
Though ... I think networkmanager uses it ?! Or maybe not
How can I prevent it from doing those things?
EDIT: i configured knetworkmanager to get the IP by dhcp, but use the DNS I told it. Same config at my girlfriends notebook
When I type resolvconf -l on her notebook there's no entry from dhcpcd or anything else. just networkmanager! |
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benneque
Tux's lil' helper
Joined: 01 Dec 2007
Posts: 134
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| Posted: Wed Oct 06, 2010 6:38 pm Post subject: |
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Hi everyone,
I found a way to temporary disable the wrong DNS entry:
"kdesu systemsettings" -> network options and remove the entry.
But I'm still searching for a real solution.
Anyone?  |
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vanclan117
n00b
Joined: 05 Oct 2010
Posts: 37
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| Posted: Wed Oct 06, 2010 11:35 pm Post subject: |
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| So went into this forum because i saw DNS, and the tech guy at school said to get through the firewall at school all i have to do is change my DNS, he said if i can figure out how then he will let me do it when i want... so my question for you guys is how do i change my DNS but stay connected to the school wifi? |
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cach0rr0
Bodhisattva
Joined: 13 Nov 2008
Posts: 4123
Location: Houston, Republic of Texas
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| Posted: Thu Oct 07, 2010 3:06 am Post subject: |
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| vanclan117 wrote: | | So went into this forum because i saw DNS, and the tech guy at school said to get through the firewall at school all i have to do is change my DNS, he said if i can figure out how then he will let me do it when i want... so my question for you guys is how do i change my DNS but stay connected to the school wifi? |
on a temporary basis?
change it in /etc/resolv.conf
it will be overwritten upon reboot, or respawning a dhcp request...but if you just want to change to test things out, change your nameserver line in /etc/resolv.conf to not use the school's DNS servers (e.g. point it at Google's public DNS, as an example)
though that has nothing to do with "getting through the firewall"
He may mean circumventing content filtering, in which case I suspect he may have deployed OpenDNS
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benneque
Tux's lil' helper
Joined: 01 Dec 2007
Posts: 134
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| Posted: Thu Oct 07, 2010 7:45 am Post subject: |
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Guys!
NEW INFORMATION!!!
rc-status from the two laptops is different:
mine says:
| Code: | Dynamic Runlevel: manual
dhcpcd
net.lo |
This should be the solution, but I don't know where it comes from
Help?!
EDIT: now I removed everything (samba, cupsd, ntp, avahi, etc.) that has anything to do with network and the entry is now correct. I will add those things now step by step to see where it comes from
EDIT2: soo... cupsd, mysql, avahi and ntp won't start dhcpcd. BUT samba and apache2 start it.
On my girlfriends laptop there's also samba in default runlevel and it won't start dhcpcd
WHY oh WHY ? |
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cach0rr0
Bodhisattva
Joined: 13 Nov 2008
Posts: 4123
Location: Houston, Republic of Texas
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| Posted: Thu Oct 07, 2010 9:04 am Post subject: |
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look at the 'need' and/or 'depend' lines in the init scripts. They should tell you.
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benneque
Tux's lil' helper
Joined: 01 Dec 2007
Posts: 134
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| Posted: Thu Oct 07, 2010 9:13 am Post subject: |
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I looked at it for samba:
On both notebooks there's no need, just depend:
| Code: | after slapd
need net
use cupsd |
Now I have a really strange samba...
I set it again to default runlevel and it fails to start. the log says: "getaddrinfo failed for name 0.0.0.0"
dhcpcd is loaded (runlevel manual), but I can stop it without stopping any other service.
When I restart samba(/etc/init.d/samba restart) samba does NOT load dhcp and it's starting without any problems.
I'm confused |
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benneque
Tux's lil' helper
Joined: 01 Dec 2007
Posts: 134
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| Posted: Thu Oct 07, 2010 9:28 am Post subject: |
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ARRR SHIT!
Don't kill me!
It was SO simple 
| Code: | | rc-update add net.lo boot |
shame on me! |
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vanclan117
n00b
Joined: 05 Oct 2010
Posts: 37
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| Posted: Thu Oct 07, 2010 12:01 pm Post subject: |
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| cach0rr0 wrote: | | He may mean circumventing content filtering, in which case I suspect he may have deployed OpenDNS |
Im pretty sure he is using OpenDNS.. so how do i get around the blocked sites? |
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cach0rr0
Bodhisattva
Joined: 13 Nov 2008
Posts: 4123
Location: Houston, Republic of Texas
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| Posted: Thu Oct 07, 2010 5:43 pm Post subject: |
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| vanclan117 wrote: | | cach0rr0 wrote: | | He may mean circumventing content filtering, in which case I suspect he may have deployed OpenDNS |
Im pretty sure he is using OpenDNS.. so how do i get around the blocked sites? |
stop querying OpenDNS's servers
see: changing resolv.conf |
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UberLord
Retired Dev
Joined: 18 Sep 2003
Posts: 6835
Location: Blighty
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benneque
Tux's lil' helper
Joined: 01 Dec 2007
Posts: 134
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| Posted: Wed Oct 13, 2010 7:16 am Post subject: |
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Hi UberLord!
A man who knows what he says , fine!
As of networkmanager I can keep both USE Flags and networkmanager chooses one of them automatically.
The ultimate question still is:
Which of both should I use? Are there differences in performance? Everything else doesn't matter, cause usability is handled by networkmanager |
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UberLord
Retired Dev
Joined: 18 Sep 2003
Posts: 6835
Location: Blighty
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| Posted: Mon Oct 18, 2010 3:29 pm Post subject: |
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| benneque wrote: |
Which of both should I use? Are there differences in performance? Everything else doesn't matter, cause usability is handled by networkmanager |
dhcpcd uses a lot less memory than dhclient.
Networkmanager (last I looked) disabled ARP checking in dhcpcd so both should be of a similar speed.
dhcpcd supports CSR which dhclient does not, but to be fair not many servers only expose CSR options.
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Use dhcpcd for all your automated network configuration needs
Use dhcpcd-ui (GTK+/Qt) as your System Tray Network tool |
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