Not able to connect the domain name behind LTM

Sure. If you use a browser or command line tool like curl to make an HTTP request using a hostname in the URL, the client (browser or CLI tool) resolves the hostname to an IP address and opens a TCP connection to the resolved IP address. The client sets the HTTP host header value in the HTTP request to the value of the hostname. If a user enters an IP address in the URL, the client inserts that IP address in the Host header value.

 

 

Here are two curl requests using a hostname and an IP address which demonstrates the different Host header values in the request:

 

 

$ curl -v www.google.co.uk

 

> GET / HTTP/1.1

 

> User-Agent: curl/7.19.6 (i686-pc-cygwin) libcurl/7.19.6 OpenSSL/0.9.8l zlib/1.2.3 libidn/1.15 libssh2/1.2

 

> Host: www.google.co.uk

 

> Accept: */*

 

 

$ curl -v 216.239.59.103

 

> GET / HTTP/1.1

 

> User-Agent: curl/7.19.6 (i686-pc-cygwin) libcurl/7.19.6 OpenSSL/0.9.8l zlib/1.2.3 libidn/1.15 libssh2/1.2

 

> Host: 216.239.59.103

 

> Accept: */*

 

 

So if you configure the client to somehow resolve the hostname you want in the Host header and the client uses that hostname in its HTTP request, the client will set the Host header to the hostname. This solution is ideal in that you don't need to modify your FastL4 VIP or using an iRule to change the requests.

 

 

Aaron