The reader is referred here to an earlier article for the basics of sniffer detection. When sniffers are working on switches, the chances of detecting them are higher. In such a scenario the sniffer is not a passive device; it performs certain activities by which it can be detected.
ARP spoofing can be detected using a program called ARP Watch. It is used to monitor the ARP cache of a machine to see if there is duplication. If there is, it could trigger alarms and lead to detection of sniffers. It can be obtained at online.securityfocus.com/data/tools/arpwatch.tar.Z
As is clear from the above sections, one method of sniffing in a switched environment is using ARP spoofing, and the machine that will most probably be ARP spoofed is the gateway. One thing that can be done is to add the MAC address of the gateway permanently to your ARP cache. This can be done by giving the -s flag to the arp command. Read more about this on the arp man page. Alternatively, you could use the /etc/ethers file for placing the MAC addresses of the important machines to prevent spoofing of those machines.
Final words of advice: Use encryption. Switch to SSH and SCP instead of Telnet and FTP.
Sumit Dhar works for SLMsoft.com.
|Happy Birthday Linux||Aug 25, 2016|
|ContainerCon Vendors Offer Flexible Solutions for Managing All Your New Micro-VMs||Aug 24, 2016|
|Updates from LinuxCon and ContainerCon, Toronto, August 2016||Aug 23, 2016|
|NVMe over Fabrics Support Coming to the Linux 4.8 Kernel||Aug 22, 2016|
|What I Wish I’d Known When I Was an Embedded Linux Newbie||Aug 18, 2016|
|Pandas||Aug 17, 2016|
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- Happy Birthday Linux
- Updates from LinuxCon and ContainerCon, Toronto, August 2016
- ContainerCon Vendors Offer Flexible Solutions for Managing All Your New Micro-VMs
- New Version of GParted
- What I Wish I’d Known When I Was an Embedded Linux Newbie
- Tor 0.2.8.6 Is Released
- NVMe over Fabrics Support Coming to the Linux 4.8 Kernel
- Blender for Visual Effects
- All about printf