Archive for February, 2011

AirPcap NX, 802.11N and the Extension channel

February 7th, 2011 No comments

IEEE 802.11n uses the multiple-input-multiple-output (MIMO) technology that enables spatial signal diversity and spatial signal multiplexing enabling increased range and data transmission rates.  802.11n allows use of wider 40 MHz channels to double the bandwidth as compared to the legacy 20 MHz operation.

AirPcap NX adaptors can be configured to capture data on 40MHz channels but you will need to determine the “extension channel” Read more…

Categories: Protocol Analysis Tags:

Troubleshooting HTTP Simple and Protected Negotiation Mechanism

February 1st, 2011 No comments

Simple and Protected GSSAPI Negotiation Mechanism (SPNEGO)

1.       A client requests (HTTP GET) a page from a server;
2.       The server returns HTTP code 401 along with a header: “WWW-Authenticate: Negotiate” (Authentication Required, and we can negotiate);
3.       The client the re-sends the request (HTTP GET) but this time with an authorisation header (“Authorization: Negotiate “) along with three “MechTypes” (for example MS Kerberos 5, Kerberos 5 and NTLMSSP);

4.       The server authenticates the client using one of the MechTypes (for example “supportedMech” used may be for an IIS server MS Kerberos 5), returning an HTTP 200 (OK) along with the last authenticate header plus the data requested.

Read more…

Categories: Uncategorized Tags: