[Solved] DNS lookups Really Slow

Gen2ly · 2009-03-06 15:34:16

I just installed a new NIC and added to rc.conf restarted the network and now my DNS lookups are painfully slow:

time ping -c 1 archlinux.org
real    0m15.232s
user    0m0.003s
sys     0m0.000s

I added the new NIC in /etc/rc.conf like this:

eth0="eth0 192.168.0.7 netmask 255.255.255.0 broadcast 192.168.0.255"
INTERFACES=(eth0)

eth1="dhcp"
INTERFACES=(eth1)

gateway="default gw 192.168.0.1"
ROUTES=(gateway)

And my hostnames are ok I think:

HOSTNAME="part-emach" # rc.conf
127.0.0.1       part-emach              localhost # /etc/hosts

The routing table looks like this:

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
71.87.120.0     0.0.0.0         255.255.252.0   U     0      0        0 eth1
0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 eth0
0.0.0.0         71.87.120.1     0.0.0.0         UG    0      0        0 eth1

I couldn't find much details on adding a new NIC expect from a page that may be outdated. Are my eth0 setting in rc.conf ok? Any thoughts?

Last edited by Gen2ly (2009-03-07 03:41:28)

mechmg93 · 2009-03-06 16:28:40

cat /etc/resolv.conf

and paste the result

Gen2ly · 2009-03-06 16:44:57

Appreciate the quick response mechmg93. resolv.conf:

search eau.wi.charter.com
nameserver 68.115.71.53
nameserver 24.196.64.53
nameserver 24.159.193.40

twiistedkaos · 2009-03-06 18:41:06

Hmm I seem to be having the same issue as of late. Nothing has changed on my system however. Was using windows for a project for about a month, Got back on linux yesterday and my DNS loopups are taking 10-15 secs as well. Download speeds seem be fine though.

cactus · 2009-03-06 22:22:20

Gen2ly wrote:

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
71.87.120.0     0.0.0.0         255.255.252.0   U     0      0        0 eth1
0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 eth0
0.0.0.0         71.87.120.1     0.0.0.0         UG    0      0        0 eth1

I couldn't find much details on adding a new NIC expect from a page that may be outdated. Are my eth0 setting in rc.conf ok? Any thoughts?

Why do you have two default gateways? That isn't right.
You only want one default gateway. I suggest commenting out the gateway lines, as your dhcp client is setting your upstream gateway for you. You don't need a gateway for an attached network (to your nic).

Gen2ly · 2009-03-07 03:40:37

Thanks cactus, got it fixed:

INTERFACES=(eth0 eth1)

eth0="eth0 192.168.0.7 netmask 255.255.255.0 broadcast 192.168.0.255"
eth1="dhcp"

The problem turned out to be with dnsmasq that binds to world ports tcp/udp 53 and 67 udp. Adding domain and bootps to /etc/hosts.allow does the trick though I just did bind-interfaces in /etc/dnsmasq. I didn't find any information on this so I wrote a wiki for it:

http://wiki.archlinux.org/index.php/Dnsmasq

Last edited by Gen2ly (2009-03-07 03:41:07)

Arch Linux

#1 2009-03-06 15:34:16

[Solved] DNS lookups Really Slow

#2 2009-03-06 16:28:40

Re: [Solved] DNS lookups Really Slow

#3 2009-03-06 16:44:57

Re: [Solved] DNS lookups Really Slow

#4 2009-03-06 18:41:06

Re: [Solved] DNS lookups Really Slow

#5 2009-03-06 22:22:20

Re: [Solved] DNS lookups Really Slow

#6 2009-03-07 03:40:37

Re: [Solved] DNS lookups Really Slow

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