I just started a new role as a network administrator and was gifted a Cisco 3750x to learn with. What next? Networking |
- I just started a new role as a network administrator and was gifted a Cisco 3750x to learn with. What next?
- Cisco rated #1 in Fortune 100's best companies to work for
- Mechanism/purpose of the NAV and its relation the the exposed node problem in 802.11
- LSA Type 4 confusing!
- Wireless Deployments - channel plans - Am I wrong?
- What is the difference between GET vs POST vs PUT? Mainly POST vs PUT? {application layer protocol computer networks}
- Pulling my hair out due to daily network outage for very specific amount of time
- PTP over different subnets
- New Intern - Into data science
- Problems with lead times and budget
- Job dilemma on how to crack the customer (error-free) process.
- Aruba CX Series ERSPAN compatibility
- Quantum networking
- Adding a redundant link to a pt to pt wifi install
- What is a best way to get full end to end overview of the connection going through multiple proxies to find out what's failing?
- ICX connection between two datacenters only allows traffic from one side
- Network automation GitHub
- VTP-Alternatives (GVRP, MVR)?
- WatchGuard BOVPN tunnel: connecting to customer server behind NAT
- Male and female connectors
| Posted: 28 May 2022 07:46 AM PDT So I recently transitioned from a desktop analyst role to a network administrator role in an enterprise healthcare environment (same company) and am about as green as it gets. I had my Net+ but no official training beyond that. As a result of getting this position I'm currently working on getting my CCNA as I gain working experience in my role. One of our Sr. Engineers gave me a retired Cisco 3750x switch to practice and learn with. I just hooked it up and consoled in but now I don't really know where to go from here... I'm thinking first and foremost I should back up the config before starting any other projects but beyond that, I have no clue where to go. Does anyone have any suggestions on small projects that would be good learning experiences? [link] [comments] |
| Cisco rated #1 in Fortune 100's best companies to work for Posted: 27 May 2022 09:43 AM PDT https://www.greatplacetowork.com/best-workplaces/100-best/2022 Everyone loves to talk trash about Cisco's products and services. What do you guys make of this news? [link] [comments] |
| Mechanism/purpose of the NAV and its relation the the exposed node problem in 802.11 Posted: 28 May 2022 07:49 AM PDT Hi, i'm trying to underestand 802.11 but i'm having an issue with the exposed node problem 802.11 uses csma/ca as the mac protocol. Every station senses the medium, if something is being sent, then they will set their NAV to the duration ID from the packet being sent weather RTS, CTS, DATA, ACK. RTS/CTS was introduced to mitigate the hidden node and exposed node problems. The exposed node problem occurs when a node in a BSS senses the But if the nodes set their nav to the duration in the RTS packet (which is then they will be backing off when CTS, therefore the problem will still persist, so is this how the nav works? Also, in the exposed node problem, why can't the node read from the RTS packet that it is being sent to a different node/AP? I also asked here https://networkengineering.stackexchange.com/questions/78972/mechanism-purpose-of-the-nav-and-its-relation-the-the-exposed-node-problems-in-8 Edit: here is a diagram explaining my problem https://i.stack.imgur.com/Ksb4G.png Thank you very much. [link] [comments] |
| Posted: 28 May 2022 04:53 AM PDT Hi everyone, I have a query about lsa Type 4. We know that an ASBR creates Type 5 LSA to show external routes. And also propogates Type 5 LSA into whole OSPF domain without changing RID of LSA. Routers in other areas do not have any clue about ASBR RID and where the ASBR is. So this is the actual reason why ABR's generate LSA Type 4. Basically, ABR's generate LSA Type 4 to indicate the Router ID of ASBR. They're just saying that "if you want to send a traffic to external route, you need to resolve the next hop, you can send traffic to me to reach that RID. First i thought that, why ABR's do not send ASBR RID within LSA Type 3. Then i found answer that it would be impossible to distinguish external prefixes and there would be no nssa or stub areas. This is fine. But my query is, why ASBR propagates LSA Type 5 to whole domain? What if that would work like ABR's will re-originate Type 5 and appends their RID in LSA Type 5. Then we wouldn't have LSA Type 4. Maybe Reddit networking family help me out. Thanks [link] [comments] |
| Wireless Deployments - channel plans - Am I wrong? Posted: 27 May 2022 06:41 PM PDT So we've been having reported issues with wifi issues in one of our offices. During our initial troubleshooting we noticed clients were connecting to APs far away vs APs directly above them. I asked a coworker of mine to conduct a wireless survey so could determine cell sizes and identify any channel interference issues. My coworker came back to me today stating they changed all of the APs in the office to channel 44 and they think that fixed the issue. So right now we have 8 APs all in one open office area on the same channel. It took every bit of me not to lose my mind hearing this. They claimed a training video recommended doing this. Of course my boss hears clients are evenly balanced across APs now and is hesitant on implementing a proper channel plan to avoid interference. My only thought is that somehow auto cell sizing on the controller minimized cells so low to avoid interference on these APs. This inadvertently resolved the issue with clients seeing APs too far away. I'm definitely worried about long term performance with them leaving the office setup this way. Has anyone ever heard of it being okay to deploy APs on the same channel? Personally that throws out everything I've ever learned about how to properly deploy wireless systems. [link] [comments] |
| Posted: 28 May 2022 10:13 AM PDT I AM EXTREMELY DUMB AND I ONLY UNDERSTAND WHEN SOMEONE EXPLAINS IN A WAY THAT A PROFESSIONAL TECHNICAL WRITER DOES. SO IGNORE THIS POST IF YOU DON'T WANT TO WASTE YOUR TIME IF YOU FEEL YOU ARE NOT THE RIGHT CANDIDATE FOR THIS POST. First of all I am not learning this currently from web development Point of view. So I think I don't need the extreme level of understanding. I am studying this in a topic called "HTTP protocol". And in my opinion, I need to learn enough to write what it does in exam paper. It is so confusing in internet. I can't explain enough. Firstly I was just confused between PUT and POST. But later someone started to tell me that you could use GET instead of these two in submitting form. That got me confused to next level. What I have already understood(be it wrong or right I am not sure). GET-: It helps to retrieve the file indicated by URL in request line from server. PUT and POST seems same thing to me. PUT places data in body to the URL in request line. POST has no such definitions anywhere in books or internet. And it is generalized as "POST is used to submit form data". But the gist of these two seems similar ie post data to server. What's the difference? And there are like 6,670,000,000 results in google. But I don't know how stupid I am to not get this.Most articles in internet are copied from each other and written pretty unprofessionally. I am not very smart. I mean smart in the sense that one who can understand anything taught by anyone and doesn't need that clarity. I need something very simplified to understand and I don't find it at least till now. https://stackoverflow.com/questions/630453/what-is-the-difference-between-post-and-put-in-http https://stackoverflow.com/questions/107390/whats-the-difference-between-a-post-and-a-put-http-request These are perhaps the only reputable answers about this but I find them very confusing. They say idemptotencyy is there in some and not in other. But I want their basic difference in working.(PUT is idempotent). Idempotent means you can keep repeating the same thing again and again but the final result will be the same as the initial result that happened when you did that thing for the first time. Is this the only difference between POST and PUT working and is their definition same? Another thing that I am seeing is PUT keeps data to be sent in URL whereas POST doesn't do it. How do we know about it? I can't see any information that shows this thing practically. (They say while googling you use PUT so that you can visit that page again as well.) But IDK how to explain, I don't know how. Just tell me the difference between PUT and POST in terms of real working difference, Like how they work. Thanks for the information. [link] [comments] |
| Pulling my hair out due to daily network outage for very specific amount of time Posted: 27 May 2022 03:27 PM PDT Hello friends, I am really confused as I am absolute networking noob. We have been having constant down time throughout the day at very consistent amount of time. What I mean by this is that, whenever the network goes down, it is down exactly for 90 seconds more or less. This happens multiple times throughout the day. It also happens around the same time of the day. We are using sonicwall firewall/router to monitor and manage the network. Whenever I see the logs when the network is down, I see absolutely nothing on the logs that shows an error message or warning. I tried running some tools to monitor trace routing, ping, and network probes. When I run tracert while the network is down, it gets stuck when it is trying to hop from our public static ip address. Our internal network can communicate with each other, just anything outside LAN is where it goes down. Is there anyway I can further troubleshoot or look out for in a case like this? Thanks for any help in advanced. [link] [comments] |
| Posted: 27 May 2022 02:42 PM PDT I have 2 machine vision GIGE cameras connected to my ubuntu machine, one through Ethernet port and another through a USB3 to ethernet adapter. Both the cameras are on different subnets with respect to each other and on same subnet with respect to the interfaces that they are connected to - Camera 1(IP - 192.168.201.2/255.255.255.0 ) to Ethernet port(IP - 192.168.201.1/255.255.255.0 ) Camera 2(IP - 192.168.200.2/255.255.255.0 ) to USB3 to ethernet adapter port(IP - 192.168.200.1/255.255.255.0 ) The clocks of these cameras now need to be synced using PTP. Whenever I run the "sync service" provided by the software vendor, both of them become master and no resolution takes place. I think cameras are not able to communicate with each other as they are not on the same subnet. I've read about bridging interfaces or tinkering with default gateway to allow them to communicate but I've not been able to work out exactly what the solution will look like. How to go about this? [link] [comments] |
| New Intern - Into data science Posted: 27 May 2022 09:52 PM PDT So we got a new intern that started this week. He's a funnier science student with an interest in data science. Do any of you have any ideas how to relate data science to networking? He's into coding, which I can show him a few automation things he can work on, but as his mentor, I really want to try to cater to what his real interests are. I was an intern here as well and had no idea what telecom was. I ended up really enjoying it and sticking with it, but at the same time I didn't really have a mentor helping me explore my interests. I just want to give the kid the best chance at finding something he loves and learning as much as he can along the way. Thanks! [link] [comments] |
| Problems with lead times and budget Posted: 27 May 2022 01:13 PM PDT I saved some money in many areas this year and am trying to buy some switches with the leftover funds. However, my company has a must be in hand policy before the budget year closes. Cisco has basically no shot of getting me switches by the end of July because of the good ole supply chain. My question is, did these past couple of years put anyone else in this situation and how did you convince the finance crews to let you order anyway? [link] [comments] |
| Job dilemma on how to crack the customer (error-free) process. Posted: 27 May 2022 02:54 PM PDT Hello Dear Network Engineers, It will be one of the discussions on how I should speak and persuade a managers on changing their thinking of 'what's right' in their imagination. Imagine this scenario. You have project A. Documentation is created, budget scheduled, team developed, etc. It get's drafted, assumption is to add two routers in the path to deliver new service and glue it somewhere in the middle of the network. *note, customer uses a lot of point-2-point services, often very critical. This takes year, maybe more. Nothing above ever get to the stage of actually installing the equipment, making it live, blow and whistle. It's still only on paper but valid & approved. Currently, through the area where these new routers will be installed, there are no critical services, but they will be routed to use this more preferable route. So on live network, currently it's not a important location but it will transfer to 'soon to be more critical'. Design of project A involves switching all of these critical services and everything is listed, but still, only on paper. Then project B starts. Project B, assumes that everything in project A (whenever it will land) will deliver its deliverables. Meaning, you're starting drafting a design documentation, that's based upon, another (not yet live) - design. Whole project B is made of an assumption, that you're assuming, project A will get on time and be error-free, deliver what was required, more importantly, nothing will ever change (although it has been approved and post approval changes are not permitted) and so on. To skip all of the bullshit with risking planning and time-management, changes throughout the projects, daily failures, missing deadlines, being unable to source the equipment (welcome in the covid world), what really bugs me is that nobody is even considering this as a "wrong" approach. Customer is saying (agree with that), that if they will always wait with another project to finish, they will vastly decrease amount of works being made on the network. I agree with that. My problem is that there are better ways on how it could look like. Simply saying, I would propose either a) Bundling these two projects together, to have everything in one place. Drawback of this is that it creates a big monster with a lot of moving parts, but at least everything is in one place... b) Create simpler designs and split it into two phases. Network & Services. Meaning - you cut the project in half. First part is only about providing network infrastructure, fibres, routers, locations, making it all live and as soon as it starts to unfold on the network, prepare service part. Option B benefits from the factor, that another projects can start drafting anything, that have solid grounds. With the modern platforms and modularity, to my mind, it's much easier to add another device, where infrastructure is deployed (racks, powering, cabling) where it's only a matter of delivering another SFP, one patch cord and device itself... My attitude towards it is "it's utterly stupid, don't ask for my assistance because I won't sign it". Unfortunately we live in the world as it is. Right now, I'm thinking about gathering some best practises, conducted by some valuable & respectable companies about how you should approach such problems and design the network, by following rules & guidelines that works best. What do you think? [link] [comments] |
| Aruba CX Series ERSPAN compatibility Posted: 27 May 2022 11:35 AM PDT I'm new to Aruba CX series switches and don't have my hands on a lab one yet.Does anyone know if the ability to use ERSPAN as defined in this article is a feature available on all of the switches that use the Aruba CX OS? We are hoping to use the CX6100 series. ArubaOS-CX - Send Mirrored Traffic to Workstation With ERSPAN (arubanetworks.com) [link] [comments] |
| Posted: 27 May 2022 04:22 AM PDT Hi everyone just out of curiosity what is everyone's perspective on quantum networking that we are hearing about do you believe it will fundamentally change the jobs of network engineer and how networks are designed and configured just curious to hear what everyone thinks [link] [comments] |
| Adding a redundant link to a pt to pt wifi install Posted: 27 May 2022 07:20 AM PDT As the title states, I'm looking to see how I can do this with the least amount of changes to my existing network. This doesn't mean I'm against buying additional equipment, but I'm not looking to re-config the VLANs/stretched L2 because the remote building needs some equipment to operate via L2. This initial install was a typical "OMG WE ARE MOVING USERS INTO THIS NEW SPACE TOMORROW AND WE DON'T HAVE ANY SERVICES AVAILABLE AT THE NEW BUILDING, WHAT CAN WE DO RIGHT NOW!!!????!!!!" request where I was tasked with getting them online ASAP with what I had available to me (I had ubiquiti nanostations on the shelf because I use them for wireless camera links in remote locations). I did have a quote for fiber between the two buildings (about 2000 ft apart) but it was too expensive and would have taken longer to get the fiber done and they needed something fast (as always). That is not an excuse that I'm giving, just reality. Here is a quick layout I made: https://i.imgur.com/hfPz54I.jpg The Main Building has a router/firewall that handles all the VLANs as sub interfaces and that parent interface (with all the VLANs) trunks to a downstream switch where the ubiquiti AP is connected to. The Main Building only sends VLANS 10, 11, 12 to the Remote Building. The Remote Building doesn't have a router/firewall, just a switch with the AP plugging into port 1 that is tagged with VLANs 10, 11, 12. The current scenario works and it solved the issue when this needed to be deployed a couple years ago. What I'd like to do is add a second wireless link to the environment, but I'm not sure how to add the link in and keep things transparent as possible. I believe I saw an option within the nanostation APs that said something about 'enable spanning tree' but I don't recall at the moment and I'm not able to log into the nanostation GUI as I create this post, but I will take a look at the nanostation GUI to see if I can find that option. Option 1- I am running spanning tree on both of those switches (main building and remote building) and I believe that if I did add a second wireless link and mirrored the port config of the respective ports that the existing nanostations plug in to, that WOULD give me a second path and STP should block one of the four AP ports to avoid a loop. Similar to having two network cables connecting two switches. Option 2- Similar to option 1, but create a LAG on each switch and assign the AP ports to the LAG so the switch sees both AP ports as a single port/LAG port. Option 3- Option 3 is the reason I made this post because I'm not sure if what I'm thinking about doing is doable because of my limited 'routing' experience. Here is what I'm thinking...Is it possible to assign wireless link 1 (blue) with 192.168.200.x IPs and assign link 2 (red) with 192.168.201.x IPs creating two separate networks between the wireless bridges and adding some type of router/l3 switch on both ends of the wireless link to handle the 'routing' in case one of the wireless links drops? Regardless of what needs to be done, this is not something that I need to implement. I'm trying to see how I can add redundancy/improve the scenario if I had to do this for another pt to pt link where I'm starting from scratch or have some flexibility to change things. I don't know if the stretching L2 can be removed from the list which is why I was trying to keep things as transparent as possible. I also don't see why spanning tree wouldn't work in this scenario and that may be the quick answer or the solution that would work with what I currently have in place from a switching perspective (I'd still have to add the second wireless link/bridge). Thanks. [link] [comments] |
| Posted: 27 May 2022 04:03 PM PDT We have two datacenters each having their networking managed by a different 3rd party. Now we've run into some issues with connection occasionally dropping for the users from DC1 trying to access applications running in DC2, there is a S2S configured between the sides. As you might expect both "managing" companies started blame ping - pong "it's not out side it's the other side". We're getting a bit of sick of this and trying to figure out a way to point to them where the traffic drops and why? We have full access to the VMs on both sides including virtual appliances the companies 'manage'. What would be the best way to get an overview of full end to end journey of the packets between clients from DC1 to applications running on DC2? The obvious thought is to run packet captures on each of the hops. Is there any tool that could help us bring all of these captures together and help to determine where the traffic is getting held up? We've got limited networking experience in our team hence we've contracted the 3rd parties. [link] [comments] |
| ICX connection between two datacenters only allows traffic from one side Posted: 27 May 2022 07:41 AM PDT I made a post in sysadmin about this and decided this would be a better place to put it. Currently we have colo in two different states but with the same colo company (Tierpoint). We purchased a circuit they call ICX which is a point to point between the primary and the secondary. Both ends are a single-mode LC handoff which I plug into a FortiSwitch on each end that is untagged vlan 1 and tagged vlan 10. The primary location has the FortiSwitches connected to the Fortigate and the secondary location has the Fortiswitches in standalone mode. At this time the links are up and online but the secondary location cannot ping the primary location UNTIL the primary location initiates the connection. For example:
Since this is basically layer 2 with the datacenter doing something in the middle, I'm not really sure how I can troubleshoot this to be honest. At the primary I can see the mac addresses of the secondary through the Fortigate in the Fortiswitch section. On the secondary location switch I can see the mac address of 10.10.0.2 to port 51 (where the ICX is plugged into) in the mac address table. I do not understand the interworking's of the datacenter but I was hoping someone with more experience than me with these circuits would have an idea why I get basically one-way communication. Tierpoint networking has taken over 24 hours trying to resolve this issue on this new circuit. Update: Datacenter confirmed it is on their end but they do not know why yet. They are thinking it is a bug [link] [comments] |
| Posted: 27 May 2022 06:05 AM PDT Apologies straight away as I really don't have much experience here and could potentially ask stupid questions but I promise it's because I can't seem to find answers. . Trying to set up a CI/CD pipeline for an on prem infrastructure, using ansible as the deployment tool and Jenkins as the pipeline coordinator or whatever you might call it. That part is fine I have run it through labs and understand that well. What I want to know is should I be storing my playbooks in GitHub and then having Jenkins pull them from GitHub as they are updated? Should I be storing config on GitHub ? I don't believe I should be I don't see the point in it but I have been asked multiple times if that's the plan and now I need to find a definitive answer. This is all from an enterprise perspective aswell with a lot of restrictions. Thanks for any help Edit: an additional question is are my playbooks replacing needing to have configuration files stored. We still will do config backups so they will always be there just want to understand if the playbooks are used along side or instead of [link] [comments] |
| Posted: 27 May 2022 05:02 AM PDT Hello everyone, I'm just a bit shocked. Coming from a Cisco area, I've been at a company for a few months now that uses everything else like Cisco. Now I just noticed in the conversation that there is no alternative to VTP in this context and therefore every switch would have to be touched by hand when rolling out a VLAN. Or if the configuration of the VLAN had to be changed. Of course, I acquired Google at this point and came across the "GVRP" (Generic VLAN Registration Protocol) or "MVR" (Multicast VLAN Registration) protocol. Unfortunately, I was not able to pull out the information from the WWW at all. Sometimes it is said that it is "just like VTP", sometimes the description sounds like something completely different to me. That's why I wanted to ask how the non-Ciscolers in the group deal with this topic and whether they have had one or two experiences with it. Many thanks in advance! [link] [comments] |
| WatchGuard BOVPN tunnel: connecting to customer server behind NAT Posted: 27 May 2022 02:01 AM PDT Hi, Starting networking guy here! I'm wondering how could I implement the following: We have a BOVPN tunnel between our application server and customer networks. The customer ISP has configured a SNAT address for all their traffic coming in the tunnel. Now I would need to make an addition to the tunnel for our application server to be able to connect to a customer server. Do I need to make another P2 with our server and the customer server as selectors or can it be done somehow using the existing one with the NAT address as customer network? As is, I figure if our server tries to connect to the customer server using the NAT address, the customer side GW will not know where to forward the traffic? [link] [comments] |
| Posted: 27 May 2022 02:15 PM PDT Is there another way to say „This is a male connector" without saying it is male or female? Just sounds so inelegant to me. If you have something language specific: I also speak German :) Dankeschön [link] [comments] |
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