tech/cisco/security

SECURITY

Cisco network security — ASA/Firepower NGFW, Umbrella DNS security, ISE identity/NAC, AnyConnect VPN.

production
requires: tech/cisco
improves: tech/cisco

Cisco Security

Stub — full skill pending. Core patterns documented below.

Products

ProductUse case
ASAStateful firewall, AnyConnect VPN headend, legacy perimeter
Firepower NGFW (FTD)Next-gen firewall, IPS, application visibility, Snort 3
FMC / FDMFirepower Management Center (centralised) or Device Manager (local)
UmbrellaDNS-layer security, cloud-delivered SASE, malware blocking
ISEIdentity/NAC, 802.1X, RADIUS, TrustSec SGT policy
AnyConnect / Secure ClientSSL/IPsec VPN, posture assessment, endpoint visibility

ASA ACL pattern

! Permit HTTPS inbound, deny all else
access-list OUTSIDE_IN extended permit tcp any host 196.x.x.10 eq 443
access-list OUTSIDE_IN extended deny ip any any log

access-group OUTSIDE_IN in interface outside

AnyConnect VPN (ASA)

! IP pool for VPN clients
ip local pool VPN_POOL 10.100.0.1-10.100.0.254 mask 255.255.255.0

! Group policy
group-policy GP_REMOTE internal
group-policy GP_REMOTE attributes
 vpn-tunnel-protocol ssl-client
 split-tunnel-policy tunnelall

! Tunnel group
tunnel-group REMOTE_ACCESS type remote-access
tunnel-group REMOTE_ACCESS general-attributes
 address-pool VPN_POOL
 default-group-policy GP_REMOTE

ISE 802.1X (basic)

! On the switch
aaa new-model
aaa authentication dot1x default group radius
aaa authorization network default group radius
dot1x system-auth-control

interface GigabitEthernet1/0/1
 authentication port-control auto
 dot1x pae authenticator

Gotchas