Network Engineering

Latest posts

Kali Linux
SNMP
Cisco IOS XE
Network Engineering
Security

Nov 14, 2026

snmp-check on Kali: Find SNMP v2c Still Answering After a v3 Migration

After an SNMPv3 migration, one leftover community still gave snmp-check the IOS version and every interface over v2c and v1. Removing it produced a timeout; SNMPv3 kept answering.

Kali Linux
IPsec
VPN
Cisco IOS XE
Network Engineering

Nov 14, 2026

How to Use ike-scan: Test an IPsec VPN Peer and Read NO-PROPOSAL-CHOSEN

A matching AES-256/SHA-256/DH14 proposal got a Main Mode handshake. A wrong DH group, a wrong hash and the right suite from an address with no PSK all got NO-PROPOSAL-CHOSEN, and only debug crypto isakmp told them apart.