- Community Home
- >
- Servers and Operating Systems
- >
- Operating Systems
- >
- Operating System - HP-UX
- >
- High DNS polling on 11.31
Categories
Company
Local Language
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Forums
Discussions
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Community
Resources
Forums
Blogs
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-11-2011 01:52 AM
тАО02-11-2011 01:52 AM
High DNS polling on 11.31
Some of our new 11.31 servers generating high high DNS polling and that caused the failure of the firewall in our environment.
Please could anyone help us in troubleshooting this.Please tell me what and all I have to check.I am not finding any unusual in the system behaviour
paabhi
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-11-2011 03:42 PM
тАО02-11-2011 03:42 PM
Re: High DNS polling on 11.31
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-12-2011 02:25 AM
тАО02-12-2011 02:25 AM
Re: High DNS polling on 11.31
If the server is sending a high number of DNS
request, I would first check if it runs some
kind of monitoring software (HP SIM, HP OpenView, and others, for example), or
scanner.
It is also possible that the server has a high number of incoming connections and it
tries to resolve reverse resource records in
DNS?
Simple tcpdump can show your traffic
statistics...
Cheers,
VK2COT
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-12-2011 05:22 PM
тАО02-12-2011 05:22 PM
Re: High DNS polling on 11.31
Change nsswitch.conf to read:
passwd: files
group: files
hosts: files [NOTFOUND=continue UNAVAIL=continue] dns
ipnodes: files [NOTFOUND=return UNAVAIL=return TRYAGAIN=return]
services: files
networks: files
protocols: files
rpc: files
publickey: files
netgroup: files
automount: files
aliases: files
Repeat this for all of your HP-UX servers. At the same time, contact the owners/mfrs of the software packages that are causing this ridiculous stream of useless resolver calls.
Bill Hassell, sysadmin
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-14-2011 10:29 AM
тАО02-14-2011 10:29 AM
Re: High DNS polling on 11.31
The bit about the backup software always looking up for each new file is disturbing - it suggests it is establishing a new TCP connection for each (at least that is the only conceivable reason I can see for making the getaddrinfo() call - and it better be a getaddrinfo() call at this point :)