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Operating Systems Linux Red Hat Network becomes slow and return fast only after restart network Post 302895303 by moshesa on Monday 31st of March 2014 05:59:38 AM
Old 03-31-2014
Network becomes slow and return fast only after restart network

Hi,
I have 2 machines in production environment:
1. redhat machine for application
2. DB machine (oracle)

The application doing a lot of small read&writes from and to the DB machine.

The problem is that after some few hours the network from the application to the DB becomes very slow and it returns to the normal only after:
Code:
service network restart

Before:
Code:
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=1 ttl=63 time=7.81 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=2 ttl=63 time=5.88 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=3 ttl=63 time=7.81 ms

After restart network:
Code:
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=84 ttl=63 time=0.135 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=85 ttl=63 time=0.171 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=86 ttl=63 time=0.153 ms

What can it be?
How can i solve this strange behavior?

Thanks.
 

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NBTSCAN(1)						      General Commands Manual							NBTSCAN(1)

NAME
nbtscan -- program for scanning networks for NetBIOS name information SYNOPSIS
nbtscan [-v] [-d] [-e] [-l] [-t timeout] [-b bandwidth] [-r] [-q] [-s separator] [-h] [-m retransmits] [-f filename | scan_range] DESCRIPTION
This manual page documents briefly the nbtscan command. This manual page was written for the Debian GNU/Linux distribution because the original program does not have a manual page. nbtscan is a program for scanning IP networks for NetBIOS name information. It sends NetBIOS status query to each address in supplied range and lists received information in human readable form. For each responded host it lists IP address, NetBIOS computer name, logged-in user name and MAC address (such as Ethernet). OPTIONS
A summary of options is included below. -v Verbose output. Print all names received from each host. -d Dump packets. Print whole packet contents. Cannot be used with -v, -s or -h options. -e Format output in /etc/hosts format. -l Format output in lmhosts format. Cannot be used with -v, -s or -h options. -t timeout Wait timeout seconds for response. Default 1. -b bandwidth Output throttling. Slow down output so that it uses no more that bandwidth bps. Useful on slow links, so that ougoing queries don't get dropped. -r Use local port 137 for scans. Win95 boxes respond to this only. You need to be root to use this option. -q Suppress banners and error messages. -s separator Script-friendly output. Don't print column and record headers, separate fields with separator. -h Print human-readble names for services. Can only be used with -v option. -m retransmits Number of retransmits. Default 0. -f filename Take IP addresses to scan from file "filename" scan_range What to scan. Can either be single IP like 192.168.1.1 or range of addresses in one of two forms: xxx.xxx.xxx.xxx/xx or xxx.xxx.xxx.xxx-xxx. BUGS
Report bugs to alla@sovlink.ru (that's autor of nbtscan). I cannot promise to do anything but I might well want fix it. Remember: no war- ranty. At least it's worth what you payed for it. AUTHOR
This manual page was written by Ryszard Lach rla@debian.org for the Debian GNU/Linux system (but may be used by others) and is based on nbtscan author's README file. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Docu- mentation License, Version 1.1 or any later version published by the Free Software Foundation. NBTSCAN(1)
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