You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.8 KiB
56 lines
1.8 KiB
5 months ago
|
When NetScaler application switch is used as L3+ switch, information
|
||
|
|
regarding the original IP and TCP headers are lost as a new TCP
|
||
|
|
connection is created between the NetScaler and the backend server.
|
||
|
|
|
||
|
|
NetScaler provides a feature to insert in the TCP data the original data
|
||
|
|
that can then be consumed by the backend server.
|
||
|
|
|
||
|
|
Specifications and documentations from NetScaler:
|
||
|
|
https://support.citrix.com/article/CTX205670
|
||
|
|
https://www.citrix.com/blogs/2016/04/25/how-to-enable-client-ip-in-tcpip-option-of-netscaler/
|
||
|
|
|
||
|
|
When CIP is enabled on the NetScaler, then a TCP packet is inserted just after
|
||
|
|
the TCP handshake. Two versions of the CIP extension exist.
|
||
|
|
|
||
|
|
Legacy (NetScaler < 10.5)
|
||
|
|
|
||
|
|
- CIP magic number : 4 bytes
|
||
|
|
Both sender and receiver have to agree on a magic number so that
|
||
|
|
they both handle the incoming data as a NetScaler Client IP insertion
|
||
|
|
packet.
|
||
|
|
|
||
|
|
- Header length : 4 bytes
|
||
|
|
Defines the length on the remaining data.
|
||
|
|
|
||
|
|
- IP header : >= 20 bytes if IPv4, 40 bytes if IPv6
|
||
|
|
Contains the header of the last IP packet sent by the client during TCP
|
||
|
|
handshake.
|
||
|
|
|
||
|
|
- TCP header : >= 20 bytes
|
||
|
|
Contains the header of the last TCP packet sent by the client during TCP
|
||
|
|
handshake.
|
||
|
|
|
||
|
|
Standard (NetScaler >= 10.5)
|
||
|
|
|
||
|
|
- CIP magic number : 4 bytes
|
||
|
|
Both sender and receiver have to agree on a magic number so that
|
||
|
|
they both handle the incoming data as a NetScaler Client IP insertion
|
||
|
|
packet.
|
||
|
|
|
||
|
|
- CIP length : 4 bytes
|
||
|
|
Defines the total length on the CIP header.
|
||
|
|
|
||
|
|
- CIP type: 2 bytes
|
||
|
|
Always set to 1.
|
||
|
|
|
||
|
|
- Header length : 2 bytes
|
||
|
|
Defines the length on the remaining data.
|
||
|
|
|
||
|
|
- IP header : >= 20 bytes if IPv4, 40 bytes if IPv6
|
||
|
|
Contains the header of the last IP packet sent by the client during TCP
|
||
|
|
handshake.
|
||
|
|
|
||
|
|
- TCP header : >= 20 bytes
|
||
|
|
Contains the header of the last TCP packet sent by the client during TCP
|
||
|
|
handshake.
|