myITmicroblog

I tried to install the IPSec VPN client on the Windows Server 2012 but I when I tried to run the client I got the error message: "Reason 442: failed to enable Virtual Adapter" I found one fix for Windows 7 (where you have to disable the “Internet Connection Sharing” on the services list) but it didn’t work for Windows Server 2012. To fix the issue on the server platform you have to find following registry key and change the field “DisplayName” for: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CvirtA  from: @oem8 . inf ,% CVirtA_Desc %; Cisco Systems VPN Adapter for 64 - bit Windows  to: Cisco Systems VPN Adapter for 64 - bit Windows

Today I would like to do some tests with the DHCPv6. Like with IP version 4, we can run DHCP server on routers or switches. Gi1 / 0 / 1 Gi1 / 0 / 2 /---- \ \ ----- / / ---- \ | R1 |-------| sw1 |-------| R2 | \- ---/ ----- \- ---/ DHCP SERVER | \ | Gi1 / 0 / 3 /---- \ | R3 | \- ---/ DHCP CLIENT In my example R1 will work as a DHCP Server and R3 as a client. First I will configure R3: ! interface FastEthernet0 / 0 no ip address ipv6 address dhcp ipv6 enable no sh end ! Then R1: ! ipv6 dhcp pool DHCP - POOL e address prefix 2001 :: /64 link-address 2001::100/ 64 domain - name t st . com ! ! interface FastEthernet0 / 0 no ip address ipv6 address 2001 :: 100 / 64 ipv6 enable ipv6 dhcp server DHCP - POOL end ! Now I confi...

Similar to IPv4, where we can create a binding table with all hosts connected, for IPv6 we can enable the IPv6 Binding Table. The table is populated by ND, DHCP registration process or static entries. Gi1 / 0 / 1 Gi1 / 0 / 2 /---- \ \ ----- / / ---- \ | R4 |-------| sw1 |-------| R5 | \- ---/ ----- \- ---/ | \ | Gi1 / 0 / 3 /---- \ | R6 | \- ---/ I enable IPv6 and apply ND policy with port role as a ‘router’. R4: R4 #sh ipv6 interface FastEthernet0 / 0 is up , line protocol is up IPv6 is enabled , link - local address is FE80 :: 223 : 4FF : FE8E : 5E08 No Virtual link - local address ( es ): Global unicast address ( es ): 2001 : 10 : 10 : 10 :: 4 , subnet is 2001 : 10 : 10 : 10 ::/ 64 Joined group address ( es ): FF02 :: 1 ...