Solved

Promiscuous mode enabled??

Posted on 2004-09-25
6
641 Views
Last Modified: 2010-03-18
I face with this problem at my syslog...some one said it's dangerous...so i need an advice to fix this...

Sep 26 07:41:36 lynx kernel: tg3: eth0: Link is up at 100 Mbps, full duplex.
Sep 26 07:41:36 lynx kernel: tg3: eth0: Flow control is off for TX and off for RX.
Sep 26 07:42:02 lynx kernel: eth1: Promiscuous mode enabled.
Sep 26 07:42:02 lynx kernel: eth1: Promiscuous mode enabled.
Sep 26 07:42:02 lynx kernel: eth2: Promiscuous mode enabled.
Sep 26 07:42:02 lynx kernel: eth2: Promiscuous mode enabled.
Sep 26 07:42:02 lynx kernel: eth1: Promiscuous mode enabled.
Sep 26 07:42:02 lynx kernel: eth1: Promiscuous mode enabled.
Sep 26 07:42:02 lynx kernel: eth2: Promiscuous mode enabled.
Sep 26 07:42:02 lynx kernel: eth2: Promiscuous mode enabled.
Sep 26 07:42:12 lynx dhcpd: if IN A STAGVER.lynx.ath.cx rrset doesn't exist add 300 IN A STAGVER.lynx.ath.cx 192.168.1.2: timed out.
Sep 26 07:42:12 lynx dhcpd: DHCPREQUEST for 192.168.1.2 from 00:11:85:0d:b3:3e (STAGVER) via eth1
Sep 26 07:42:12 lynx dhcpd: DHCPACK on 192.168.1.2 to 00:11:85:0d:b3:3e (STAGVER) via eth1
Sep 26 07:47:13 lynx dhcpd: if IN A STAGVER.lynx.ath.cx rrset doesn't exist add 300 IN A STAGVER.lynx.ath.cx 192.168.1.2: timed out.
Sep 26 07:47:13 lynx dhcpd: DHCPREQUEST for 192.168.1.2 from 00:11:85:0d:b3:3e (STAGVER) via eth1
Sep 26 07:47:13 lynx dhcpd: DHCPACK on 192.168.1.2 to 00:11:85:0d:b3:3e (STAGVER) via eth1
0
Comment
Question by:lilie795
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
6 Comments
 
LVL 40

Expert Comment

by:jlevie
ID: 12152572
That's normal and necessary for a machine that's running a DHCP server, which yours obviously does.
0
 

Author Comment

by:lilie795
ID: 12153637
you mean that just a log file for admin to see?
0
 
LVL 2

Expert Comment

by:fulp02
ID: 12155147
You can not spend your whole life reading log file find the stuff you need to know and grep it out.
so say you wanted to know anything going on with dhcp   grep *dhcp* syslogfile
Alittle off topic but it will save you loads of time in the end
0
 
LVL 40

Accepted Solution

by:
jlevie earned 45 total points
ID: 12155436
A Unix/Linux system will always log an interface being placed in promiscous mode. While there are legitimate reasons for that happening, it could be a rogue application like a password capture tool. Some of the legitimate reasons include:

A DHCP server
Authorized use of a sniffer (e.g. tcpdump, ethereal)
Any of the network Intrusion Detection Systems (e.g. snort)
Any of the network traffic analysis tools (e.g., ntop, iptraf, etc)

as the SysAdmin you'd know if any of those were in legitimate use on the system and thus know that the warning could be ignored if it only occurs when one of those was started. Seeing that at any other time would be cause for alarm and investigation.
0

Featured Post

Portable, direct connect server access

The ATEN CV211 connects a laptop directly to any server allowing you instant access to perform data maintenance and local operations, for quick troubleshooting, updating, service and repair.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
url shaping application 8 60
Install dhcp server on Ubuntu server 4 85
Linux on a Dell PowerEdge 720 3 172
Weird Samba Connectivity Issue... 7 89
I have seen several blogs and forum entries elsewhere state that because NTFS volumes do not support linux ownership or permissions, they cannot be used for anonymous ftp upload through the vsftpd program.   IT can be done and here's how to get i…
Note: for this to work properly you need to use a Cross-Over network cable. 1. Connect both servers S1 and S2 on the second network slots respectively. Note that you can use the 1st slots but usually these would be occupied by the Service Provide…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question