Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

ARP issue

Avatar of enlightenedinc
enlightenedinc asked on
NetworkingHardware FirewallsSwitches / Hubs
8 Comments1 Solution868 ViewsLast Modified:

We are having a issues with multiple devices on our network not being able to connect to the Internet but can get to network shared, deivices, etc. It started with two servers have issues and now we have random desktops, laptops, servers, and even WAP's having Internet issues.

When a computer cannot get out to the internet we check the ARP cache by going to cmd prompt arp -a and notice that the firewall is either not listed or says invalid.  When we manually enter the ARP entry for the firewall internet is restored immediately.

SonicWall Pro 3060 firewalls (two- both have ARP issues one more than the other, DHCP and VPN on firewall)
D-link- switch- had collisions on one port
two netgear and a linksys.

One company recommended that the switch be replaced. We replaced the switch with a brand new HP switch, plugged both firewalls and all servers and switches directly into the new switch and still had the ARP issue. See attachment for further troubleshooting we have done.  

SonicWall technical support recommended we upgrade the firmware on the firewall because it may be causing the issue. Any other input would be greatly appreciated.

Avatar of digitap
This problem has been solved!
Unlock 1 Answer and 8 Comments.
See Answers