Tuesday, August 15, 2017

Slow Internet Surfing on Cisco 891fw

I was doing a new config for a Cisco 891fw but had extremely slow internet surfing speeds.

When doing a speed test however, speed was fine.

The issue was MTU.

To fix this, on my VLAN that I assigned to my clients I needed to run the following command to stop the packets fragmenting:

ip tcp adjust-mss 1200

Make sure you put this on the VLAN itself, not the Dialer Interface.

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