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#1
Home and Small Office Networking / Re: The computer has rebooted ...
Last post by deanwebb - February 20, 2024, 10:08:52 AM
I've been dealing with Windows upgrades since 1995, and always hit issues on upgrades that get resolved with a clean install. Stuff just breaks with upgrades, so I never upgrade. I just get a new laptop with the OS it installs with and ride that to the end of that laptop's life.
#2
Home and Small Office Networking / Re: The computer has rebooted ...
Last post by icecream-guy - February 19, 2024, 05:54:26 AM
Quote from: deanwebb on February 17, 2024, 09:50:11 PMIs this a clean installation or an upgrade?

If an upgrade, is there any way you can do a clean install?

no not a clean install, it's been my laptop for about a year,  rather not do a clean install.
#3
Home and Small Office Networking / Re: The computer has rebooted ...
Last post by deanwebb - February 17, 2024, 09:50:11 PM
Is this a clean installation or an upgrade?

If an upgrade, is there any way you can do a clean install?
#4
Home and Small Office Networking / Re: The computer has rebooted ...
Last post by icecream-guy - February 16, 2024, 04:50:40 PM
Quote from: icecream-guy on February 16, 2024, 04:29:37 PMhow can I investigate this without forking out $$$ to Micros**t

from windows 11 system event log: today

The computer has rebooted from a bugcheck.  The bugcheck was: 0x0000004e (0x0000000000000007, 0x00000000004d420e, 0x0000000000000001, 0x0000000000000000). A dump was saved in: C:\WINDOWS\Minidump\021624-37796-01.dmp. Report Id: af82ef39-64d8-405d-a293-0f0bc1a6fb9e.

I looked at the .dmp file with wordpad but it was all gibberish. Seems like I am hitting something like this every day now for the past week or so.

I did purchase Norton Utilities Ultimate last week, and it did clean up a bunch of crap on my computer.

maybe it's time to run SFC /scannow.

Seems like it did something:

Beginning system scan.  This process will take some time.

Beginning verification phase of system scan.
Verification 100% complete.

Windows Resource Protection found corrupt files and successfully repaired them.
For online repairs, details are included in the CBS log file located at
windir\Logs\CBS\CBS.log. For example C:\Windows\Logs\CBS\CBS.log. For offline
repairs, details are included in the log file provided by the /OFFLOGFILE flag.

log file is 3106KB

#5
Home and Small Office Networking / The computer has rebooted from...
Last post by icecream-guy - February 16, 2024, 04:29:37 PM
how can I investigate this without forking out $$$ to Micros**t

from windows 11 system event log: today

The computer has rebooted from a bugcheck.  The bugcheck was: 0x0000004e (0x0000000000000007, 0x00000000004d420e, 0x0000000000000001, 0x0000000000000000). A dump was saved in: C:\WINDOWS\Minidump\021624-37796-01.dmp. Report Id: af82ef39-64d8-405d-a293-0f0bc1a6fb9e.

I looked at the .dmp file with wordpad but it was all gibberish. Seems like I am hitting something like this every day now for the past week or so.

I did purchase Norton Utilities Ultimate last week, and it did clean up a bunch of crap on my computer.

maybe it's time to run SFC /scannow.
#6
Certifications and Careers / Re: Certification Goals for 20...
Last post by deanwebb - February 14, 2024, 07:44:25 PM
Yeah, RHEL is the new CentOS, looks like. :)
#7
Certifications and Careers / Re: Certification Goals for 20...
Last post by config t - February 14, 2024, 06:47:58 PM
Crushed it this time. I want to do RHCA next since Forescout is shifting from CentOS back to red hat. I need to focus on zscaler for employer reasons though.
#8
Homework Help / Re: How does DHCP client knows...
Last post by config t - February 06, 2024, 09:32:42 PM
Quote from: deanwebb on February 06, 2024, 09:39:19 AMThe network device that the client is attached to handles the DHCP request. The request is bound to a MAC address, so the network device makes sure that the request gets back to the device with that MAC address. In the case of multiple DHCP servers, the first to respond will be the one the client goes with.

To add to this; The network device handling the DHCP request, usually a switch, is the DHCP-Relay. It sends the layer 2 broadcast frames encapsulated as unicast UDP packets to the configured DHCP server(s). On a Cisco switch these are the "ip-helper" addresses configured on SVI.

DHCP service can also be configured locally on a device such as a router or L3 switch. We do this in cases where remote sites only have access to DHCP servers across unreliable or very low bandwidth WAN links that make UDP communication difficult.
#9
Homework Help / Re: How does DHCP client knows...
Last post by Otanx - February 06, 2024, 02:26:57 PM
Not sure why your book says it is a broadcast. The ACK is a Unicast back to the client. However, even if it is a broadcast the DHCP packet contains the Client MAC address. See the Wireshark Wiki here: https://wiki.wireshark.org/DHCP

The first capture file on that page has a basic DHCP session. You can see the Discover and Request are both broadcasts. However, the Offer and Ack are both Unicast.

-Otanx
#10
Homework Help / Re: How does DHCP client knows...
Last post by networkloser - February 06, 2024, 10:55:57 AM
The next screen capture shows the Ethernet portion of the DHCP ack packet.
The Ethernet destination address is FFFFFFFFFFFF, which is the broadcast hard-
ware address, and the Ethernet source address is 005004744FFF, which is the
hardware address of the DHCP server

The DHCP portion of the DHCP ack packet contains information about the IP
address and the lease parameters. The following screen capture shows the DHCP
portion with all the DHCP options. After the DHCP client receives this acknowledg-
ment, then the client has an IP address. Now that the client has a valid lease on an
IP address, the client finishes building its TCP/IP stack.


Taken from TCP/IP foundations by andrew G blank