My Network Security Journal

This Cisco link covers the GRE Tunnel and how a keepalive works. I got a GRE over IPSec VPN configured between Singapore and London. The GR...

There's a "hidden" Cisco ASA CLI command in order to retrieve the SNMP MIB OID info without performing an SNMP walk from a rem...

We've encountered an outage in our Cisco FPR 2100 High Availability (HA) pair running ASA OS. The Primary ASA firewall crashed or auto r...

I had to reconfigure a Cisco switchport mode from access to a trunk in order to run multiple VLANs in a Cisco ASA firewall interface. I conf...

Here's a Cisco link for troubleshooting an IPSec anti-replay errors.  I was troubleshooting and observed a lot %CRYPTO-4-PKT_REPLAY_ERR...

I had to troubleshoot a site-to-site IPSec VPN in a Cisco ASA firewall in Multiple Context mode. The IKE Phase 1 State was stuck in MM_WAIT_...

I had an issue wherein I couldn't SSH to a Cisco ASA firewall and received a key exchange error. I've checked the configured SSH key...