asterisk users - Aug 2005 - Cisco and "protocol application invalid"

Hey all!

 

Have configured a Cisco 7960 with no problems, put up an TFTP server and it
downloaded new sip binaries ? all went well.

 

However, now I am having trouble getting two 7040s to work. Basically, my
problem is the above stated error message. If I had any entries in the TFTP
logfile, I could probably solve this problem. But the thing is, it just
doesn?t look as if the phones are connecting to TFTP at all.

 

Figured I?ll use a packet sniffer to find out which IP-address the phone
uses for connecting to a TFTP. That turned out to be rather complicated.
First, since I run routers and switches, sniffing packets on the LAN is a
hard task. Then I sat up a wireless connection to the internet and onnected
the phone to the computer using a shared internet connection, hoping that
Windows built-in DHCP server would get the packets flowing. It did, but no
packets could tell me which IP-address the phone is trying to reach?

 

Is there any way of getting to know which IP address Cisco uses to contact
TFTP?

 

 

Regards,

Bjorn


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On 20:23, Sun 14 Aug 05, Bjorn Ove Kristiansen wrote:
> Hey all!
> 
> Have configured a Cisco 7960 with no problems, put up an TFTP server and it
> downloaded new sip binaries ? all went well.
> 
> However, now I am having trouble getting two 7040s to work. Basically, my
> problem is the above stated error message. If I had any entries in the TFTP
> logfile, I could probably solve this problem. But the thing is, it just
> doesn?t look as if the phones are connecting to TFTP at all.
> 
> Figured I?ll use a packet sniffer to find out which IP-address the phone
> uses for connecting to a TFTP. That turned out to be rather complicated.
> First, since I run routers and switches, sniffing packets on the LAN is a
> hard task. Then I sat up a wireless connection to the internet and onnected
> the phone to the computer using a shared internet connection, hoping that
> Windows built-in DHCP server would get the packets flowing. It did, but no
> packets could tell me which IP-address the phone is trying to reach?
> 
> Is there any way of getting to know which IP address Cisco uses to contact
> TFTP?
> 
> Regards,
> 
> Bjorn
> 
Hi,

I have put this in my dhcpd.conf to make sure my cisco
phones connect to my TFTP server:
server-name "192.168.2.1";

I use the ISC dhcpd for Debian.

Greetz,
-- 
Michiel van Baak
http://michiel.vanbaak.info
michiel@vanbaak.info
GnuPG key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x7E0B9A2D

"Why is it drug addicts and computer afficionados are both called
users?"

On 8/14/05, Bjorn Ove Kristiansen <bok2@online.no> wrote:
> Is there any way of getting to know which IP address Cisco uses to contact
> TFTP? 
Why you're making things hard for yourself for no good reason? Unlock
the config, put a static entry for ip that belongs to the segment its
sitting on (RFC1918 or not), put a static entry for your TFTP server
and upgrade. When all goes well setup your DHCP pools with the tftp
options for future use.
 
> Regards, 
> 
> Bjorn 
Hope that helps a bit
nkm