2016-03-25

Windows 2008 R2: Multiple IP's on single netwotk interface and how to change outgoing IP

I have Windows 2008 R2 server with single network interface and ip 10.10.10.17. On server runing multiple services like sql, sftp, http, https, file server. Today i added additional ip adress 10.10.10.10 and assigned only to web services, but after some time noticed that 10.10.10.10 ip are used in other services as outgoing ip. Ipconfig /all command show 10.10.10.10 ip  "above" 10.10.10.17:

Ethernet adapter INTRANET:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection #2
   Physical Address. . . . . . . . . : 00-0C-EE-EE-EE-EE
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 10.10.10.10(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.224
   IPv4 Address. . . . . . . . . . . : 10.10.10.17(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.224
   Default Gateway . . . . . . . . . : 10.10.10.1
   DNS Servers . . . . . . . . . . . : 10.10.10.11 10.10.10.12
   NetBIOS over Tcpip. . . . . . . . : Enabled



Looks like Windows Server 2008 R2 use for outgoing traffic closest to GW ip.
Problem solved  using cmd commands:

netsh interface ipv4 delete address "INTRANET" 10.10.10.10
netsh interface ipv4 add address "INTRANET" 10.10.10.10 255.255.255.224 skipassource=true


Ipconfig /all after fix:

   IPv4 Address. . . . . . . . . . . : 10.10.10.17(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.224
   IPv4 Address. . . . . . . . . . . : 10.10.10.10(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.224


/Geecoholic

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