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#91
Routing and Switching / Add a backup router to the int...
Last post by adhossain - February 06, 2024, 03:55:02 AMI have a simple network setup where my fiber optic cable connects to the GPON and the CAT6 cable from the GPON connects to a openwrt router. The openwrt router then connects to a switch and the switch delivers internet to the wifi access point and my connected PCs.
Now I want to add a Pfsense backup router from the same gateway so that the CAT6 cable from the GPON will connect to the managed switch using VLAN and both router will also connect to the managed switch using VLAN so that, if one router fails, I can have continuous internet. The managed switch will also distribute internet to other networking devices using separate VLAN.
Maybe this sounds stupid but wondering if it is possible. if so, any guidance?
Now I want to add a Pfsense backup router from the same gateway so that the CAT6 cable from the GPON will connect to the managed switch using VLAN and both router will also connect to the managed switch using VLAN so that, if one router fails, I can have continuous internet. The managed switch will also distribute internet to other networking devices using separate VLAN.
Maybe this sounds stupid but wondering if it is possible. if so, any guidance?
#92
Homework Help / How does DHCP client knows tha...
Last post by networkloser - February 06, 2024, 02:15:09 AMLet's discuss the "DORA" of DHCP.
1) Discover
Client broadcasts that "I want IP address".
Destination IP address=All 0s.
Destination hardware address=All Fs.
Source hardware address=DHCP Client address
2) Offer
Server/s makes an offer.
Destination hardware address=client's mac address
So that client knows the offer is for it.
It also should contain server's IP address/es.
3) Request
Client broadcasts DHCP request packet.
This includes,
DHCP Server's IP address so that other can cool down their IP address so client gets from who it wants.
Client's hardware address so that client hardware->IP address mapping can be done.
Destination address is All Fs, so that all hosts receive the notification.
4) Acknowledgement.
I am following TCP/IP foundations by Black and I'm confused how will the client know that the acknowledgement came for it?
1) Discover
Client broadcasts that "I want IP address".
Destination IP address=All 0s.
Destination hardware address=All Fs.
Source hardware address=DHCP Client address
2) Offer
Server/s makes an offer.
Destination hardware address=client's mac address
So that client knows the offer is for it.
It also should contain server's IP address/es.
3) Request
Client broadcasts DHCP request packet.
This includes,
DHCP Server's IP address so that other can cool down their IP address so client gets from who it wants.
Client's hardware address so that client hardware->IP address mapping can be done.
Destination address is All Fs, so that all hosts receive the notification.
4) Acknowledgement.
I am following TCP/IP foundations by Black and I'm confused how will the client know that the acknowledgement came for it?
#93
Management Tools / Switch SNMP Connectivity Issue
Last post by config t - February 05, 2024, 05:49:16 PMOn one of the enclaves I support there are around 190 switches and routers managed by my NAC tool. The switch objects are configured with profiles so the settings are the same for each group. Several of the switches are getting SNMP cred fail errors and the answer doesn't seem to be obvious (to me).
-the snmp service account and snmp group/view is configured the same across switches
-snmpwalk from the connecting appliance says cred fail
-all of the switches are on the same network with connectivity to managing appliances, so pretty sure its not fw related
-switches are same model/version (C9300)
Can't figure out what I am missing. I think we already looked for an inbound/outbound acl. MIB? I would think MIB is the same on a particular version.
I hate to say it could be something as dumb as a wrong password. Nobody can seem to agree on what the SNMP password is for this particular account. Terrible PAM practices should be frowned upon.
-the snmp service account and snmp group/view is configured the same across switches
-snmpwalk from the connecting appliance says cred fail
-all of the switches are on the same network with connectivity to managing appliances, so pretty sure its not fw related
-switches are same model/version (C9300)
Can't figure out what I am missing. I think we already looked for an inbound/outbound acl. MIB? I would think MIB is the same on a particular version.
I hate to say it could be something as dumb as a wrong password. Nobody can seem to agree on what the SNMP password is for this particular account. Terrible PAM practices should be frowned upon.
#94
Everything Else in the Data Center / Re: moving the datacenter
Last post by deanwebb - February 05, 2024, 08:54:41 AMPrepare for regular "cry tests" when you unplug stuff and wait to see if anyone cries about it. If nobody cries, then don't move that asset. You will not move everything. Taking a good look at what the visibility tool discovers in the datacenter will help with finding esoteric items from bygone days that need to not graduate up to the new DC.
Even worse is the data part of the datacenter. Those teams that manage data need to have a data visibility tool in place ($VENDOR alert, my company works with Alation as a partner in that space) to discover all the data and determine what's currently accessed and what can be sent off to long-term cold storage and forgotten.
Even worse is the data part of the datacenter. Those teams that manage data need to have a data visibility tool in place ($VENDOR alert, my company works with Alation as a partner in that space) to discover all the data and determine what's currently accessed and what can be sent off to long-term cold storage and forgotten.
#95
Everything Else in the Data Center / moving the datacenter
Last post by icecream-guy - February 03, 2024, 12:59:46 PMAnyone have any experience with moving a data center? out Fed wants to move one of our fairly large data centers, it's in an 80 year old building, they want to gut and refurbish the building. Lessons learned?
#96
Home and Small Office Networking / Re: General network architectu...
Last post by deanwebb - February 02, 2024, 09:32:43 AMThat's a broad question. Generally, architecture is a description of the solutions in place and how they interact. There's a level of detail to the documentation for a solution:
Architectural Handbook (AH): a high-level view of the solutions, providing guiding principles for the deployment. Should initial design choices run into difficulties, use the AH to provide guidance in how best to resolve those difficulties.
High Level Design (HLD): Details hardware and software to be acquired along with licensing, where it will go, how it will be rolled out, and system settings to be used.
Low Level Design (LLD): Specifies on an interface level how things are to be connected. Often a set of network diagrams with explanatory notes.
In the Americas, the documents tend to be brief. In Europe, they tend to be larger and more wide-ranging.
That being said, the architecture for you scenario would specify the order the devices mentioned would be arranged. We'd want to know more about whether those are running on separate platforms or on the same one. Also, is this for accessing an external-facing application that is exposed to the Internet, or is this for access to an internally-hosted application that is not otherwise exposed to the Internet? Those answers will determine how the pieces fall together.
To boost architecture skills, ask more questions and get more answers. Architecture involves learning about many different technologies so that you have a range of tools to draw upon when asked to solve for a particular business case.
Architectural Handbook (AH): a high-level view of the solutions, providing guiding principles for the deployment. Should initial design choices run into difficulties, use the AH to provide guidance in how best to resolve those difficulties.
High Level Design (HLD): Details hardware and software to be acquired along with licensing, where it will go, how it will be rolled out, and system settings to be used.
Low Level Design (LLD): Specifies on an interface level how things are to be connected. Often a set of network diagrams with explanatory notes.
In the Americas, the documents tend to be brief. In Europe, they tend to be larger and more wide-ranging.
That being said, the architecture for you scenario would specify the order the devices mentioned would be arranged. We'd want to know more about whether those are running on separate platforms or on the same one. Also, is this for accessing an external-facing application that is exposed to the Internet, or is this for access to an internally-hosted application that is not otherwise exposed to the Internet? Those answers will determine how the pieces fall together.
To boost architecture skills, ask more questions and get more answers. Architecture involves learning about many different technologies so that you have a range of tools to draw upon when asked to solve for a particular business case.
#97
THE MUSEUM OF FORUM FAIL / XEVIL 5: the best software for...
Last post by Mariskast7711 - February 01, 2024, 04:54:58 AM<some Software> automatically solve most kind of captchas,
Including such type of captchas: ReCaptcha-2, ReCaptcha-3, Hotmail (Microsoft), Google, SolveMedia, BitcoinFaucet, Steam, Amazon, Twitter, Microsoft, Twitch, Outlook, +12000
+ hCaptcha, ArkoseLabs FunCaptcha, ReCaptcha Enterprize supported in new XEvil 6.0!
1.) Fast, easy, precisionly
<some Software> is the fastest captcha killer in the world. Its has no solving limits, no threads number limits
you can solve even 1.000.000.000 captchas per day and it will cost 0 (ZERO) USD! Just buy license for 69 USD and all!
2.) Several APIs support
<some Software> supports more than 6 different, worldwide known API: 2Captcha, <snip> (antigate), RuCaptcha, DeathByCaptcha, etc.
just send your captcha via HTTP request, as you can send into any of that service - and <some Software> will solve your captcha!
So, <some Software> is compatible with hundreds of applications for SEO/SMM/password recovery/parsing/posting/clicking/cryptocurrency/etc.
3.) Useful support and manuals
After purchase, you got access to a private tech.support forum, Wiki, Skype/Telegram online support
Developers will train <some Software> to your type of captcha for FREE and very fast - just send them examples
4.) How to get free trial use of <some Software> full version?
- Try to search in Google "Home of <some Software> "
- you will find IPs with opened port 80 of <some Software> users (click on any IP to ensure)
- try to send your captcha via 2captcha API ino one of that IPs
- if you got BAD KEY error, just tru another IP
- enjoy!
- (its not work for hCaptcha!)
WARNING: Free <some Software> DEMO does NOT support ReCaptcha, hCaptcha and most other types of captcha!
http://<snip>.com
Including such type of captchas: ReCaptcha-2, ReCaptcha-3, Hotmail (Microsoft), Google, SolveMedia, BitcoinFaucet, Steam, Amazon, Twitter, Microsoft, Twitch, Outlook, +12000
+ hCaptcha, ArkoseLabs FunCaptcha, ReCaptcha Enterprize supported in new XEvil 6.0!
1.) Fast, easy, precisionly
<some Software> is the fastest captcha killer in the world. Its has no solving limits, no threads number limits
you can solve even 1.000.000.000 captchas per day and it will cost 0 (ZERO) USD! Just buy license for 69 USD and all!
2.) Several APIs support
<some Software> supports more than 6 different, worldwide known API: 2Captcha, <snip> (antigate), RuCaptcha, DeathByCaptcha, etc.
just send your captcha via HTTP request, as you can send into any of that service - and <some Software> will solve your captcha!
So, <some Software> is compatible with hundreds of applications for SEO/SMM/password recovery/parsing/posting/clicking/cryptocurrency/etc.
3.) Useful support and manuals
After purchase, you got access to a private tech.support forum, Wiki, Skype/Telegram online support
Developers will train <some Software> to your type of captcha for FREE and very fast - just send them examples
4.) How to get free trial use of <some Software> full version?
- Try to search in Google "Home of <some Software> "
- you will find IPs with opened port 80 of <some Software> users (click on any IP to ensure)
- try to send your captcha via 2captcha API ino one of that IPs
- if you got BAD KEY error, just tru another IP
- enjoy!
- (its not work for hCaptcha!)
WARNING: Free <some Software> DEMO does NOT support ReCaptcha, hCaptcha and most other types of captcha!
http://<snip>.com
#98
Home and Small Office Networking / General network architecture f...
Last post by networkloser - February 01, 2024, 02:21:36 AMWhat is the general architecture of a network that comprises of Web Application Firewall(F5), Firewall, VPN, reverse proxy(nginx)?
I am new to this field and I am wondering what the architecture in general looks like? And where can I learn more about this? Any courses or certification exams that I can do to boost my network architecture skills?
I am new to this field and I am wondering what the architecture in general looks like? And where can I learn more about this? Any courses or certification exams that I can do to boost my network architecture skills?
#99
Homework Help / Re: IT infrastructuur plaat DM...
Last post by deanwebb - January 28, 2024, 11:19:04 AMIt may be that this is a development environment, regardless of the end purpose of the application or product, so I went with that idea in my response.
#100
Homework Help / Re: IT infrastructuur plaat DM...
Last post by icecream-guy - January 27, 2024, 05:49:26 PMcircuit boards? AND and OR gates, transistors, resistors are a bit out of league here if you are trying to design a circuit board.
from google translator English to Dutch
Printplaten? AND OR poorten, transistors, weerstanden zijn hier een beetje buiten de competitie als je een printplaat probeert te ontwerpen.
from google translator English to Dutch
Printplaten? AND OR poorten, transistors, weerstanden zijn hier een beetje buiten de competitie als je een printplaat probeert te ontwerpen.