-
Research
and Publications
Current Issue
March/April 2013
EDUCAUSE ReviewPublications
-
Conferences
and Events
Annual Conference
October 15–18, 2013
Save the date!Events for all Levels and Interests
Whether you're looking for a conference to attend face-to-face to connect with peers, or for an online event for team professional development, see what's upcoming.
-
Career
Development
EDUCAUSE Institute
Leadership/Management Programs
Explore MoreCareer Center
Leadership and Management Programs
EDUCAUSE Institute
Advanced Programs
Project Management
Jump Start Your Career Growth
Explore EDUCAUSE professional development opportunities that match your career aspirations and desired level of time investment through our interactive online guide.
-
Focus Areas
and InitiativesLatest Topics
EDUCAUSE organizes its efforts around three IT Focus Areas
Join These Programs If Your Focus Is
-
Connect
and ContributeFind Others
Get on the Higher Ed IT Map
Employees of EDUCAUSE member institutions and organizations are invited to create individual profiles.
-
About
EDUCAUSE
dynamic arp inspection + bad DHCP clients (printers)
Message from msheiny@seas.upenn.edu
Hello, Saw some e-mails here about Dynamic Arp Inspection (DAI) as a layer-2 defense mitigation for switches - we've been testing this in our own environment and I had some questions that maybe one of you have run into before. I've started seeing issues where some of our HP printers (that are getting static IPs via DHCP) are not obeying their lease-time restriction and checking back into the DHCP server in a timely fashion. This means that consequently they are getting blocked on the switch for some-time until they go out and renew their DHCP lease again. Now we have Brocade devices, not Cisco, but it seems the DAI implementation is pretty similar from what I've read thus far. Has anyone experienced anything like this with network printers + DAI? Thanks for any insight in advance! -- -~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~ Michael Sheinberg Network Security Administrator, CETS School of Engineering and Applied Science -~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~ ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Hello, Saw some e-mails here about Dynamic Arp Inspection (DAI) as a layer-2 defense mitigation for switches - we've been testing this in our own environment and I had some questions that maybe one of you have run into before. I've started seeing issues where some of our HP printers (that are getting static IPs via DHCP) are not obeying their lease-time restriction and checking back into the DHCP server in a timely fashion. This means that consequently they are getting blocked on the switch for some-time until they go out and renew their DHCP lease again. Now we have Brocade devices, not Cisco, but it seems the DAI implementation is pretty similar from what I've read thus far. Has anyone experienced anything like this with network printers + DAI? Thanks for any insight in advance! -- -~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~ Michael Sheinberg Network Security Administrator, CETS School of Engineering and Applied Science -~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~ ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Recommend
Comments
Jason, Are you using Juniper EX switches? We were having that problem with only our HP printers for about a month and all we ended up doing was restarting the junipers and the problem went away. Not very scientific I know but it ended up working, problem hasn't reoccured in 3 months. Best, Ryan Young Network Administrator The Masters School Dobbs Ferry, NY 10522 On 2/2/12 4:19 PM, "Jason Healy" wrote: >
Jason, Wanted to let you know that we had the problem reoccur, but we have change the slp-keep-alive to 1 on the printers and they seem to be staying online. http://h30499.www3.hp.com/t5/Black-and-White/LaserJet-4250-and-4350-Intermi ttently-losing-network-connection/td-p/4986057 Best, Ryan On 2/2/12 8:33 PM, "Jason Healy" wrote: >