- Enterasys Security Router User's Guide
Configuration Examples
16-28 Configuring Security on the XSR
– Terminate Network Extension Mode (NEM) and Client mode tunnels
– Terminate remote access L2TP/IPSec tunnels
– Terminate PPTP remote access tunnels
– Firewall inspection on the public VPN interface (the crypto map interface)
– Firewall inspection on the trusted VPN interface (the connection to the corporate
network)
– Enable NAT Traversal on the firewall
– OSPF routing with the next hop corporate router on the trusted VPN interface
– DF bit clear on the public VPN interface to handle large non-fragmentable IP frames
– OSPF routing over the multi-point VPN interface for other site-to-site tunnels
– Assign the first IP address of the pool to the multi-point VPN interface
Figure 16-16 XSR Firewall, VPN and OSPF Topology
Begin by setting the XSR system time via SNTP. This configuration is critical for XSRs which use
time-sensitive certificates.
XSR(config)#sntp-client server 10.120.84.3
XSR(config)#sntp-client poll-interval 60
Add four ACLs to permit IP pool, L2TP and NEM traffic:
XSR(config)#access-list 110 permit ip any 10.120.70.0 0.0.0.255
XSR(config)#access-list 120 permit udp any any eq 1701
XSR(config)#access-list 140 permit ip any 172.16.1.0 0.0.0.255
XSR(config)#access-list 150 permit ip any 192.168.111.0 0.0.0.255
Define IKE Phase I security parameters with the following two policies:
XSR(config)#crypto isakmp proposal xp-soho
XSR(config-isakmp)#hash md5
XSR(config-isakmp)#lifetime 50000
XSR(config)#crypto isakmp proposal p2p
XSR(config-isakmp)#authentication pre-share
XSR(config-isakmp)#lifetime 50000
Configure IKE policy for the remote peer:
XSR(config)#crypto isakmp peer 0.0.0.0 0.0.0.0
XSR
172.16.1.0
Internet
Internet
router
SSR
XP PC
Client
141.154.196.93
96.96.96.7
96.96.96.0
141.154.196.106
FE1
FE2
10.120.84.0
10.120.112.0
NEM
XSR
XSR
6
4
2
7
5
3
CM/1
PS2PS1
CM
21 21
87654321 87654321
87654321 87654321
87
6
5
4
3
21
SSR-CM-2 CONTROL MODULE
10/100BASE-TXSSR-HTX12-08
10/100BASE-TXSSR-HTX12-08
10/100BASE-TXSSR-HTX12-08
10/100BASE-TXSSR-HTX12-08
1000BASE-LXSSR-GLX19-02
SSR-8
SSR-8
1000BASE-SXSSR-GSX11-02
100BASE-FXSSR-HFX11-08
SSR-PS-8
100-125~5A
200-240~3A
50-60 Hz
PWR
SSR-PS-8
100-125~5A
200-240~3A
50-60 Hz
PWR