Posted:
Wed Jun 09, 2004 5:39 pm Post subject: Ethereal packet captures while vonage boxes connects
I've been doing some ethereal packet sniffing on my Vonage mta while i unplug it and plug it back in..
It looks like each time I do this the box fails authentication once or twice, then it passes authentication the next time it tries. -here is a section of the a packet when it fails
Authorization: Digest username="myphone#", realm="216.115.25.20", nonce="1801737013", uri="sip:atlas5.atlas.vonage.net:5061", response="md5 key is in here", algorithm=MD5
Only difference seems to be that when it passes it had an md5 key in there, which i assume is my encrypted password and my phone # as the username... the nonce="1801737013" , does anyone know what that is? it appears in both
It's all part of the digest authentication mechanism. The first request has to fail. It triggers the server to send the nonce value which the client uses as part of a hash of the userid, password etc. The hash is then returned to the server which does the same hash operation. If the 2 hashs are equal, you're authorized. This way, the password itself isn't sent over the wire.
Students at IIT in Chicago recently completed labs with call tracing using Ethereal. The .ppt presentation has a section on the call setup and teardown process. See: http://ewh.ieee.org/r4/chicago/recent.html
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