Huge undocumented network, need some pointers

1

Diagrams.net

#Digital Whiteboard #Diagrams #Flowcharts 229 social mentions

2

NetDisco

Set up netdisco and have it discover everything. You'll have to seed it switch IPs and have snmp RO set up but it should be able to help map things out. Use oxidized to get the configs, this will need an account on the switches and knowledge of all the switch IPs. This would be my bare minimum. Make some diagrams too, manually doing this helps me understand how things are laid out and connected.

#Network Automation #Configuration Auditing #Change Management 16 social mentions

3

Oxidized

Set up netdisco and have it discover everything. You'll have to seed it switch IPs and have snmp RO set up but it should be able to help map things out. Use oxidized to get the configs, this will need an account on the switches and knowledge of all the switch IPs. This would be my bare minimum. Make some diagrams too, manually doing this helps me understand how things are laid out and connected.

#Network Automation #Configuration Auditing #Change Management 18 social mentions

4

Nmap

NMAP is your friend here. What platforms are the switches being used? If they're Cisco, inspecting the VLAN database and trunk configuration is going to go a long way to helping you understand what's going where, as is CDP/LLDP.

#Security #Security Monitoring #Monitoring Tools 187 social mentions