NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
C3000 with hung DHCP process?
I have a Netgear C3000 cable modem/gateway, connected to Comcast. Multiple Macs in the house, with both WiFi and Ethernet access to the gateway. Everything generally works, but every few days one o...
vkdelta -- thanks for jumping in on this!
--The web-based Netgear Genie page does show FW version v2.02.06. [As I understand it, this is pushed by the cable operator, Comcast.]
--The problem has happened, on and off, ever since we got the Netgear modem/gateway. But it is intermittant -- can happen multiple times in one day, and then does not re-emerge for a couple of weeks.
--I have downloaded a copy of WireShark 2.0.0, fired it up on a Mac, but do not really know how to use it. It's hard to predict when the problem will emerge.
a. Can WireShark run in the background, even when the Mac goes to sleep?
b. Is there an easy way to set it so that it only collects DHCP packets?
Thanks again for your help!
I am assuming your Macbook gets stuck during DHCP process at times.
here is short tutorial from external party. The key is choosing right Interface (ethernet or Wifi) and filter the packets. Put the filter as "bootp or dhcpv6 or dns" in the filter. this will capture DHCPv4, DHCPv6 and DNS packets.
http://www.howtogeek.com/104278/how-to-use-wireshark-to-capture-filter-and-inspect-packets/
a. Can WireShark run in the background, even when the Mac goes to sleep?
>> I dont think it runs when MAC goes to sleep. to start with you can capture only when the issue happens
b. Is there an easy way to set it so that it only collects DHCP packets?
>> Please use the filter above.
I very much appreciate your guidance.
Will load up WireShark, wait for the next time we have a problem, start WireShark, and watch what happens before and after the Netgear re-boot.
May take a while before we have the problem, at a time when I am here to try to capture it -- but will let you know when it happens!
Thanks again!
No problem. I will be here.
Let me know if you see it again. we would like to know more details as well as it will help everyone. and THANK YOU for trying to replicate and willing to work with us.
Well, this morning when I woke my desktop iMac from sleep it could not connect to the Internet -- and it was the machine on which I had loaded WireShark (!).
[One note: looking at Preferences/Network the machine seemed to have a long IP-V6 address, but no IP-V4 address, no DNS field, nor anything else.]
Sadly, I had not yet practiced how to run WireShark with capture filters, but I did this:
a. Ran for a little bit, to get a "pre-restart" sample, and saved the file.
b. Started a second run, went downstairs, re-booted the router, waited until the machine could fully access the Internet (first gets address, takes longer to get Comcast DNS fields), stopped WireShark, and saved a second (longer) file.
What is the best way to send these 2 files to you?
Thanks for the ongoing help.
John