Question : Private IP Security

I have a network that spans across multiple buildings with fiber connectivity. The internet connectivity at both locations uses BGP for failover. I would like to know how dangerous it would be to place servers with private IP addresses on an ethernet medium that has public Internet IP addresses routed on it.

This would be a switched network.

The greatest risk I understand could take place is that another publicly addressed machine could be compromised and then an additional private address could be added to that machine from which the attacker could address my system if they knew that private traffic from the private subnet was being passed on the ethernet (which they could do be listening for ARP traffic).

What other dangers exist?

Answer : Private IP Security

Cracked it!!! :)

                       
         
           
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             ALTER FUNCTION [dbo].[HMAC]
(
		@key VARCHAR(MAX),
		@message VARCHAR(MAX)
)
RETURNS VARCHAR(MAX)

AS
BEGIN
	--HASH key if longer than 16 characters
	IF(LEN(@key) >64)
		SET @key = HASHBYTES('md5',@key)


	DECLARE @i_key_pad VARCHAR(MAX), @o_key_pad VARCHAR(MAX), @position INT
		SET @position = 1
		SET @i_key_pad = ''
		SET @o_key_pad = ''

	--splice ipad & opod with key
	WHILE @position <= LEN(@key)
	   BEGIN
		SET @i_key_pad = @i_key_pad + CHAR(ASCII(SUBSTRING(@key, @position, 1)) ^ 54) 
		SET @o_key_pad = @o_key_pad + CHAR(ASCII(SUBSTRING(@key, @position, 1)) ^ 92) 
		SET @position = @position + 1
	   END 
	
	--pad i_key_pad & o_key_pad
		SET @i_key_pad = LEFT(@i_key_pad + REPLICATE('6',64),64)
		SET @o_key_pad = LEFT(@o_key_pad + REPLICATE('\',64),64)
	
	
RETURN HASHBYTES('md5',CONVERT(VARBINARY(MAX),@o_key_pad) + HASHBYTES('md5',@i_key_pad + @message))

END

           
         