SFP Question Networking |
- SFP Question
- /31 mask on Wan interface of firewall.
- PoE++ ethernet switch?
- Question about cellular
- Multiple static IPs to avoid ports (80,443) used twice
- Do you guys have any recommendations of learning material to take a deep dive into TCP (and Wireshark)?
- Help me with an IP camera & Network switch fiasco please
| Posted: 29 Aug 2020 04:41 AM PDT Hi guys, I have bought a Ubiquiti EdgeRouter 4 with 1 SFP port and 2 Netgear gc110 switches and would like to connect them via fiber but I will need SFP modules. Now my question is can it just be one brand? or does Ubiquiti need Ubiquiti and does Netgear need Netgear? I hope you guys can help. Thanks in advance. [link] [comments]  |
| /31 mask on Wan interface of firewall. Posted: 29 Aug 2020 11:24 AM PDT Is it possible for an ISP to assign you a /31 mask to use on your wan interface of your router or Firewall? Typically when a customer needs a single IP from an ISP they assign a /30 and use 1 IP on their interface and 1 gets assigned to the customers device. 1 is used as the network address and 1 is used as a broadcast address. Out of 4 ips 2 are wasted and the customer only receives 1 useable. Wouldn't a /31 give the customer the same thing but save the ISP 2 ip's? IP on ISP interface 1 IP on customer interface. No network address and no broadcast. I guess my question is could an ISP hand out /31 instead of /30's to save ip space? Or does a client need the network and broadcast address of /30 subnet. UPDATE Thanks everyone for your input, seems the answer is yes aslong as the equipment supports the /31 mask. Thanks again! [link] [comments]  |
| Posted: 29 Aug 2020 02:04 PM PDT this may be a bit off topic for this subreddit, but I figured someone here might have an idea. I work in video production, mostly live events. we just got these amazing robo cams that can be powered via a PoE++ switch. (our old robos used PoE+, and I have confirmed our current PoE+ switch does not power these new cameras) the cameras can also be powered via 4-pin XLR, which is fairly standard for high-end cameras, but it is very convenient to be able to power via the ethernet cable that controls the camera, and not have to run an extension cord out to a usually very crowed stage. So, I've googled PoE++ to look for some purchase options, but, and this is the darndest thing, I can't seem to find anything. Its like PoE++ switches don't actually exist. The engineering spec for PoE++ exists, but, no actual pieces of hardware. am I an idiot? a blink idiot? Anyone have any ideas? Bueller? [link] [comments]  |
| Posted: 29 Aug 2020 08:45 AM PDT Hello, I'm studying for my sec+ and net+ certs. I'm not sure this is covered in those exams, but I'm very curious on cellular technology. Talking about 4G LTE voice and sms data, the stuff we think of as "phone" services, are still just converted and passed to the TCP/IP stack same as the data connection? But it doesn't become an IP packet until it makes it to the tower and is then converted? I'm having trouble finding good info about the process online. Thanks in advance guys! [link] [comments]  |
| Multiple static IPs to avoid ports (80,443) used twice Posted: 29 Aug 2020 03:02 PM PDT Hi there, keepin it short. Read the rules and not sure if I'm using the right forum? I do have one static ip, webhosting my site there. Want to host myself a Synapse Server to chat and a Bitwarden Instance. Those two would also want to use 80 and 443. As I'm new to networking at all, I wanted to ask if there is a Way to make that possible? Couldn't find clues in a reasonable time and decided to ask instead of headin in the wrong direction. Your God of Mischief, Loki [link] [comments]  |
| Posted: 29 Aug 2020 11:57 AM PDT Most of my career I have mostly been worried about layers 1, 2, and 3. Node A can reach Node B - we're good. But in my current job, I'm learning that TCP packet analysis is an invaluable skill that I need to use almost all day, every day. This is my first time actually truly diving into packet analysis. I've done it before, but not nearly at this level. This is my first time taking captures across multiple devices and trying to figure out what's going on. For example, I'm currently working on a case where there is a source, firewall, and destination capture. I can tell from the captures that the firewall seems to be dropping the return traffic (or there is some routing issue on the return traffic). But that's not my concern with this post. I'm only using it as an example. What I want to learn more about is TCP itself. In the source capture pictured below, I see [SYN, ECN, CWR], [SYN, ECN, CWR], then [SYN]. I see the first two in the firewall, but not the [SYN]. ... yet, I see a third [SYN, ECN, CWR] in the firewall. A total of 4 [SYN, ECN, CWR] in the firewall. Picture of PCAPs here: https://imgur.com/a/QxJaTZj Why only 2 retransmits but 3 out of order packets? Why the simple [SYN] after [SYN, ECN, CWR], and why am I not seeing that in the firewall capture? That's the level of TCP I want to learn. [link] [comments]  |
| Help me with an IP camera & Network switch fiasco please Posted: 29 Aug 2020 09:41 AM PDT Hi, as all these tricky jobs go I got drafted in to add to and sort out some issues on a previous install. NVR - Router - connected together in a basement Router - 80m cat6 - Network switch 1 (2 uplinks and 4 POE ) Network switch 1- 20m cat5 to 1 4mp cctv camera Network switch 1 - 200m cat 6 to network switch 2 Network switch 2 ( has option for cctv and lan mode) - 10m cat6 to ANPR camera Network switch 2 - 10m cat6 to 2mp camera Network switch 2 - 10m cat 5 to 4 mp camera The added bonus is an an additional alarm output cable from the NVR to a motorised barrier using cat6 but at nearly 300m It was working although with lags and delay but now the alarm triggers in the cameras are not opening the gate, if I manually trigger the alarm on the NVR you can hear the relay make noise and work but nothing happens. It was working well until network switch 1 was introduced to add the 4 mp camera. Any and all help is much appreciated Thanks [link] [comments]  |
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