Thursday, March 25, 2021

Blocking ICMP one way

I work at an institution that has public wifi. We have three VLANs - VLAN 100 is for public use, VLAN 1 is for Management, and VLAN 5 is for staff PCs.

We want to stop VLAN 100 from sending any ICMP requests to VLANs 1&5 and still be allowed to send ICMP requests to VLAN 100 from 1&5. Unfortunately, every time I try to set up an ACL, it stops all ICMP traffic. I'm obviously doing something wrong. If anyone knows the proper Cisco Switch commands to set this up properly, please let me know. I can't find anything online that seems to be exactly what I'm looking for. Our network addresses are as follows:

VLAN 100: 192.168.100.1 /22

VLAN 5: 192.168.5.1 /24

VLAN 1: 192.168.1.239 /24



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