Sounds like in your step 3. your trying to capture in the
wrong part of the network i.e. your monitor point does not see the
traffic your trying to capture
Two remedies, check the wireshark.org website for help on
where to plug in and monitor, or buy an air-pcap adapter to sniff the
wifi.
PS - I think your work
network is blocking SIP port 5060 if your trying to use a SIP
client.
I am new to wireshark and network monitoring, so please bear with me.
I am looking for some guidance on how to solve a specific network
problem...
The problem
My T-Mobile MYTouch 4G is supposed to be able
to make calls over wifi. It connects to some wifi hot spots, but not
others. In particular, it connects at a local Stabucks for wifi calls, but now
my office wifi network. I need to find a way to make it work over my office
network. The kicker is the phone says I am connected to wifi at both locations,
but just can't make a phone call using wifi over my office network.
Basically, one enables Wifi, and the phone scans and connects to a network. This
process succeeds in both locations. There is a second button to enable wifi
calling, which fails on my office network, but not at Starbucks. The error I
message when it does not connect is "Connection Error - ISP or T-Mobile Network
Error." T-Mobile technical support says it is a problem with my network, so I am
SOL. But, they cannot tell me what my network has to do to be compatible with
wifi calling.
I thought I might be able to use wireshark see what
happens when the phone connects at Starbucks and not on my office network, to
see if I can change my network to work with wifi calling. My network setup -
Linksys WRT54G Wireless Router configured as an access point connected to a
BEFSX-41 Linksys router, which is connected to my cable modem. I use MAC
filtering and WPA and AES with a pre-shared key for wireless
security.
Questions...
1. Is my initial assumption that I can use
wireshark to figure out what is not working with my network and what is working
at Starbucks for wifi calls even feasible? Do I have a chance of figuring out
what needs to be changed on my network to make wifi calling work?
2. Do I
need a PhD in LAN Diagnostics to figure out what is happening on my network
versus Starbucks and fix my network?
3. I fired up wireshark on my work
network and starting capturing packets on eth0. I looked at the DHCP routing
table in the router and found the phone was assigned 192.168.25.203. I set a
filter for that address (ip == 192.168.25.203 or eth.addr == f8:db:7f:42:db:75),
hit a web page on the phone and no packets were captured, even though the phone
says it was connected to the wireless network. The page loaded on the phone.
Tried sending/receiving an email. I also tried hitting the "enable wifi calling"
button, and no packets. What am I doing
wrong?
Thanks,
Mark
