Aug 4, 2024
My New Top 4 BEST VPNs - HUGE CHANGES!
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My New Top 4 BEST VPNs - HUGE CHANGES!
DVTI LAB Topology
Today I have configured a practice DVTI setup. The routing used was OSPF, there are static routes on the PC1 and PC2 devices. Remember to enable redistribution for static.
See below configuration for R1 the server and R2 the Remote client as per above Topology.
R1(config)#crypto isakmp policy 1 R1(config-isakmp)#authentication pre-share R1(config-isakmp)#encryption 3des R1(config-isakmp)#hash sh R1(config-isakmp)#group 2 R1(config-isakmp)#exit R1(config)# R1(config)#crypto isakmp client configuration group admin R1(config-isakmp-group)#key admin R1(config-isakmp-group)#pool admin R1(config-isakmp-group)#acl stacl R1(config-isakmp-group)#exit R1(config)# R1(config)#ip local pool admin 192.168.100.100 192.168.100.254 R1(config)# R1(config)#ip access-list extended stacl R1(config-ext-nacl)#permit ip 192.168.101.0 0.0.0.255 any R1(config-ext-nacl)#exit R1(config)# R1(config)#crypto isakmp profile isakmp_pro R1(conf-isa-prof)#match identity group admin R1(conf-isa-prof)#client configuration address respond R1(conf-isa-prof)#client authentication list default R1(conf-isa-prof)#isakmp authorization list default R1(conf-isa-prof)#virtual-template 1 R1(conf-isa-prof)#exit R1(config)# R1(config)#crypto ipsec transform-set ez esp-3des esp-sha-hmac R1(cfg-crypto-trans)#mode tunnel R1(cfg-crypto-trans)#exit R1(config)# R1(config)#crypto ipsec profile cisco R1(ipsec-profile)#set transform-set ez R1(ipsec-profile)#set isakmp-profile isakmp_pro R1(ipsec-profile)#exit R1(config)#interface virtual-template 1 type tunnel R1(config-if)#ip unnumbered serial 0/0 R1(config-if)#tunnel source serial 0/0 R1(config-if)#tunnel mode ipsec ipv4 R1(config-if)#tunnel protection ipsec profile cisco %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON R1(config-if)#exit R1(config)#aaa new-model R1(config)#aaa authentication login default local R1(config)#aaa authorization network default local R1(config)#username cisco privilege 15 secret cisco
R2(config)# R2(config)#crypto ipsec client ezvpn ccc
R2(config-crypto-ezvpn)#username cisco password cisco R2(config-crypto-ezvpn)#mode client R2(config-crypto-ezvpn)#peer 101.1.1.100 R2(config-crypto-ezvpn)#group admin key admin R2(config-crypto-ezvpn)#connect auto R2(config-crypto-ezvpn)#int f0/0 R2(config-if)#crypto ipsec client ezvpn ccc inside R2(config-if)#int s0/1 R2(config-if)#crypto ipsec client ezvpn ccc outside R2(config-if)# *Mar 1 00:36:23.671: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON
A Request to enter in the command (crypto ipsec client ezvpn xauth) will be generated. You will then be prompted for username and password this will be cisco and cisco as per my configuration above.
The configuration will now be completed.
If you have any questions feel free to message me.
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vpn extension
This is an example of a Static VTI configuration:
See above topology, same as last config ensure that both “sites” have internet connection to the ISP router.
Below is the configuration used, ensure both sides are configured correctly with the same configuration:
From Configuration Terminal
crypto isakmp policy 1 authentication pre-share encryption aes hash sha group 5 lifetime 1800 exit crypto isakmp key cisco add 0.0.0.0 crypto ipsec transform-set t-set esp-aes esp-sha-hmac mode tunnel exit crypto ipsec profile cisco set transform-set t-set exit interface tunnel 0 %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to down ip add 192.168.1.2 255.255.255.0 tunnel mode ipsec ipv4 tunnel protection ipsec profile cisco exit %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON interface tunnel 0 ip ospf 10 area 0 exit router ospf 10 network 192.168.0.0 0.0.255.255 area 0 exit interface tunnel0 tunnel source fa0/0 tunnel destination 102.1.1.100 exit
%LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up %OSPF-5-ADJCHG: Process 10, Nbr 102.1.1.100 on Tunnel0 from LOADING to FULL, Loading Done
To Confirm configuration
R1#show crypto ipsec sa
interface: Tunnel0 Crypto map tag: Tunnel0-head-0, local addr 101.1.1.100
protected vrf: (none) local ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0) remote ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0) current_peer 102.1.1.100 port 500 PERMIT, flags={origin_is_acl,} #pkts encaps: 40, #pkts encrypt: 40, #pkts digest: 40 #pkts decaps: 39, #pkts decrypt: 39, #pkts verify: 39 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 0, #pkts compr. failed: 0 #pkts not decompressed: 0, #pkts decompress failed: 0 #send errors 0, #recv errors 0
local crypto endpt.: 101.1.1.100, remote crypto endpt.: 102.1.1.100 path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0/1 current outbound spi: 0x33306896(858810518) PFS (Y/N): N, DH group: none
inbound esp sas: spi: 0x15FCFCCD(368901325) transform: esp-aes esp-sha-hmac , in use settings ={Tunnel, } conn id: 1, flow_id: 1, sibling_flags 80000040, crypto map: Tunnel0-head-0 sa timing: remaining key lifetime (k/sec): (4297365/3396) IV size: 16 bytes replay detection support: Y Status: ACTIVE(ACTIVE)
inbound ah sas:
inbound pcp sas:
outbound esp sas: spi: 0x33306896(858810518) transform: esp-aes esp-sha-hmac , in use settings ={Tunnel, } conn id: 2, flow_id: 2, sibling_flags 80000040, crypto map: Tunnel0-head-0 sa timing: remaining key lifetime (k/sec): (4297365/3396) IV size: 16 bytes replay detection support: Y Status: ACTIVE(ACTIVE)
outbound ah sas:
outbound pcp sas:
R1#show crypto engine connections active Crypto Engine Connections
ID Type Algorithm Encrypt Decrypt LastSeqN IP-Address 1 IPsec AES+SHA 0 40 40 101.1.1.100 2 IPsec AES+SHA 41 0 0 101.1.1.100 1002 IKE SHA+AES 0 0 0 101.1.1.100
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Why do large enterprises prefer Citrix over traditional VPN for remote work?
In this video, I explain Citrix vs VPN using a Hollywood-style cinematic story, focusing on real enterprise thinking, not technical jargon or diagrams.
You’ll clearly understand:
How VPN and Citrix handle remote access differently
Why VPN trusts the device, while Citrix controls the session
Where work and data actually happen in each model
Why enterprises care more about control, security, and scale
When VPN is okay — and when Citrix is the better choice
This video is ideal for:
Citrix beginners and intermediates
IT freshers and support engineers
Career switchers entering enterprise IT
Anyone confused about Citrix vs VPN
No architecture.
No configuration.
Just clear the enterprise logic explained calmly.
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