Wednesday, December 16, 2020

Sensitive Network Device Dropping Off the Network

We have a piece of old school video gear that has been dropping off our network recently. Basically the device has an old 100Mb NIC built-in and seems to be very sensitive to network conditions.

The current working theory is the increased number of ARP broadcasts on our network being too much for the device's poor quality NIC to handle.

Question: Enabling storm control on the device's switchport wouldn't help here since it only works on ingress traffic, right? Storm control would need it to work on egress from switch > my device which isn't a thing as far as I'm aware.

Looking at some network graphs today we noticed that since our firewall upgrade we are seeing a lot more ARP traffic on the network. My theory is that upgrading our firewalls (about a month ago) caused many DHCP leases to expire and therefore many devices are still trying to reach the old IP's.

I've ran Wireshark captures and can start to go device to device and attempt to suppress the storms manually but I'm wondering if anyone else has any tips or tricks to deal with old/sensitive network devices?

Thanks!



No comments:

Post a Comment