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Old 03-26-2014, 03:57 AM   #1
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Registered: Nov 2011
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local ip resolving taking time due to /etc/resolv.conf

I'm facing an issue in local ip resolving due to resolv.conf. if i remove /etc/resolv.conf local ip resolving is happening fastly but internet connectivity will not happen as resolv.conf is not available for DNS resolution.

My Local IP is on which I will do corba communication & is my DNS server ip.

I created /etc/resolv.conf in below way:
user$cat /etc/resolv.conf
# Generated by Connection Manager
domain localhost5.localdomain5

/etc hosts in below way:
user$cat /etc/hosts localhost.localdomain localhost localhost5.localdomain5 localhost5
::1 localhost6.localdomain6 localhost6

when i do corba communication on, communication will becoming slow as is taking time for resolving. when i remove /etc/resolv.conf corba communication will become fast, i feel in this situation, resolving is not taking time as there is no /etc/resolv.conf.

I'm attaching strace log of my binary which will use for corba communication

In the log you will being used instead of corba ip you will see lot of Timeouts in polling also. Donno why all these things are happening

i tried nameserver,search also in /etc/resolv.conf for but nothing helped me

i want local ip & external sites resolving both should happen fastly through /etc/resolv.conf.

how i can do the same

route table looks like below:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default UG 0 0 0 eth0.7 * U 0 0 0 eth2 * U 0 0 0 eth0.3 * UH 0 0 0 eth0.3 * U 0 0 0 eth0.4 * U 0 0 0 eth0.5 * U 0 0 0 eth0.6 * U 0 0 0 eth0.7 * UH 0 0 0 eth0.7 * UH 0 0 0 eth0.7 * U 0 0 0 eth0.8 * U 0 0 0 eth1
Attached Files
File Type: txt localhost4.txt (170.6 KB, 11 views)

Last edited by NagaManjunath; 03-26-2014 at 09:27 AM.
Old 03-26-2014, 09:46 AM   #2
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In file /etc/nsswitch.conf, what is the "hosts:" line? You want "files" to be checked before "dns"
Sorry. Too hasty. Ignore that.

Last edited by rknichols; 03-26-2014 at 09:58 AM. Reason: too hasty
Old 03-26-2014, 09:54 AM   #3
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Hi rknichols,

I tried /etc/nsswitch.conf with below changes already, but no help
hosts: files dns

if i delete my default gateway like below:

route delete default gw

some times resolving is happenig fastly

i want resolving to happen fastly for local ips, external fastly

how i can manage resolv.conf, /etc/nsswitch.conf /etc/hosts & route to acheive same?
Old 04-14-2014, 08:33 AM   #4
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If any one has any answer pls let me know. i'm stuck here
Old 04-14-2014, 09:42 AM   #5
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My /etc/nsswitch.conf handles that:

The entry
hosts:      files mdns4_minimal [NOTFOUND=return] dns myhostname
directs name resolution to files first (so any host in the /etc/hosts file will be used first) then the optional MS dns protocol, followed by the real DNS. The "myhostname" is a plugin to reach a NSS name cache... and is also optional. A suggested minimum is "files dns".

BTW: sometimes the "mdns4_minimal [NOTFOUND=return]" can be dropped as if there IS a windows domain controller it may not be responding - causing long timeouts before the system goes to using DNS directly.

Last edited by jpollard; 04-14-2014 at 09:47 AM.


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