Free Certifications and IT Conference Registrations (where they usually give out codes for more free certifications) Networking |
- Free Certifications and IT Conference Registrations (where they usually give out codes for more free certifications)
- CCIEs of reddit: how long was your average read/day?
- why TCP BBR throughput still significantly affected by packet loss.
- New Data Center - ToR Singlemode or Multimode?
- Juniper:EVPN:VXLAN - Router id mismatch with source vtep
- New FTTH connection, problems with SSL VPN, slow file opening
- Juniper Campus EVPN-VXLAN Fabric
- upgrade to FGT 6.2.3 and issues with an office reaching our EMR and VMware View
- Why can i manage a domain on multiple platforms?
- Am I missing something ? /32 subnet mask for PPPoE
| Posted: 02 May 2020 01:55 AM PDT |
| CCIEs of reddit: how long was your average read/day? Posted: 02 May 2020 02:22 PM PDT Hi everyone. I struggle. I have always struggled. I do not know whether I am too lazy or borderline ADHD. But my max. concentration study time is 2 hours/day. After that my brain cannot absorb anything else and I would just stare at the void as I am unable to store any new information. Should I just quit my dream target or is there a trick to it? [link] [comments]  |
| why TCP BBR throughput still significantly affected by packet loss. Posted: 02 May 2020 10:45 AM PDT After reading this medium post [1] about BBR, where they simulate packet loss using the following command : sudo tc qdisc add dev eth0 root netem loss 1.5% But throughput drop from 8.55 Gbits/sec to 2.49 Gbits/sec with TCP BBR. Since BBR is designed to respond only to actual congestion by modeling the real available bandwidth I don't understand why the throughput is reduced this much. Is it because the model still assume the available bandwidth is this small ? [1] https://medium.com/google-cloud/tcp-bbr-magic-dust-for-network-performance-57a5f1ccf437 [link] [comments]  |
| New Data Center - ToR Singlemode or Multimode? Posted: 02 May 2020 03:22 PM PDT I'm trying to build a cable plant design for a new data center. I have to spec out a lot of multimode fiber for the server folks who insist on using fibrechannel for storage, but for regular ethernet traffic should I also stick to multimode or should I go with singlemode? As speeds push to 100Gb and 400Gb is multimode no longer a viable option? I'm just getting up to speed on 400Gb now, but it seems like there is no bidi option for multimode but instead requires a full MPO24(!) Any thoughts from data center folks? [link] [comments]  |
| Juniper:EVPN:VXLAN - Router id mismatch with source vtep Posted: 02 May 2020 11:00 AM PDT Dear, I hope you guys doing well and safe! Juniper noob here trying to learn EVPN VXLAN after loads and loads some digging, I arrived to the config shown below, but really I can not find why my commit fails, with the following error This is the config I have on one of lab MX Why oh why!! Have you seen this before? Is there any easy to follow one workbook for learning EVPN / VXLAN? I appreciate your comments and directions ppacv [link] [comments]  |
| New FTTH connection, problems with SSL VPN, slow file opening Posted: 02 May 2020 03:23 AM PDT Hi, i'm here to ask help to identify the root cause of a FTTH connection that is acting very poorly to open files via SSL VPN. Here the spec:
Previusly, we had a RDSL 15 mbit download and 3 mbit up at that site and opening a file took actually less time. What i'm seeing: when i'm connected via SSL VPN (provided by the Zywall) to that server, if i try to open a 3 Mbyte excel file i get Excel freezing for about 10 second, then i see that excel is actually opening the file, i see the progress about at 15% increments, each one last about 3/4 second. Total time to open a 3 mbyte file is about 40 second. This doesn't change if i use my workstation or another, or if i have Excel already opened or not. What i've done until now:
In wireshark i tried to get some data (this data has been created today, when the performance seems a little better but i'm the only one connected today, yesterday with 5 people via VPN the opening time in SMB2 report was 23 seconds) SMB2 Service Response Time Statistics - Ethernet 2: Index Procedure Calls Min SRT (s) Max SRT (s) Avg SRT (s) Sum SRT (s) --------------------------------------------------------------------------- SMB2 Close 6 208 0.017751 0.123955 0.027319 5.682350 Create 5 205 0.018134 0.123470 0.030133 6.177226 Find 14 30 0.050237 0.087804 0.056980 1.709402 GetInfo 16 92 0.018054 0.104919 0.025832 2.376504 Ioctl 11 16 0.018615 0.057483 0.025317 0.405076 Read 8 54 0.018147 1.829909 0.245593 13.262049 Tree Connect 3 6 0.018539 0.022023 0.019451 0.116708 Write 9 12 0.018514 0.066883 0.023869 0.286423 SMB2 --------------------------------------------------------------------------- [link] [comments]  |
| Juniper Campus EVPN-VXLAN Fabric Posted: 02 May 2020 04:51 AM PDT Has anyone here used Junipers campus EVPN fabric? I am looking at different solutions for VXLAN overlays to allow layer 2 connectivity across a fabric without creating a huge L2 domain like I have today. This is required for different vendors that have statically assigned mobile devices and cant do DHCP. Has anyone used the Juniper solution on their EX series switches, creating a spine/leaf architecture? Most the info I have found from an end user perspective is their data center solution. Does anyone have experience with the campus solution? How stable has it been? Have you ran into any issues? How easy is it to configure and maintain? Have you used this with multiple routing instances (VRFs)? Thanks [link] [comments]  |
| upgrade to FGT 6.2.3 and issues with an office reaching our EMR and VMware View Posted: 02 May 2020 04:24 AM PDT Hi - we are a small hospital that recently upgraded our Fortigate firewall from 5.6.11 to 6.2.3 per their recommendations. The upgrade went smoothly, albeit a couple minor issues, one being that our SSLVPN users couldn't reach our internal ADFS / SSO server due to a caveat in the new code, which tech support was able to remedy by enabling auxiliary session (https://docs.fortinet.com/document/fortigate/6.2.3/technical-tip-enabling-auxiliary-session-with-ecmp-or-sd-wan/19/fd47765) However, one issue remains, and that is that a healthcare org that we closely work with is no longer able to reach our EMR (which is publicly accessible via a pub DNS record and SSL cert), as well as our VMware View connection server. Both of these should be reachable over 443, and from our firewall rules should be allowed in. I've confirmed I am able to publicly hit both from the internet, regardless of where I am, can access both on my smartphone for example, AND I can successfully access both via this healthcare org's PUBLIC wifi (seperate network). But this healthcare org it seems to be timing out when navigating via https while on their wired and secure wifi network - the telnet port tests show connectivity over 443, but to me it seems like a TLS issue - their web browsers are showing "Cannot connect to this site securely". I don't have any control over this org but as far as their IE Security options go, they allow TLS 1.0, 1.1, and 1.2, but they're all grayed out due to GPO policy that I can't edit. They say they are allowing all 3 and I believe them based on what I see, but why can't they then hit our 2 sites on 443 securely? The POC I worked with Friday said he whitelisted our domains with wildcard entries for our domain name on their webfilter, but I'm still skeptical. If I can reach these sites right now from my home machine, what would make this "our issue"? And I don't doubt that we have some part to play in it; the issue occurred following our firewall upgrade, so I am open to any insight or suggestions. Thanks! [link] [comments]  |
| Why can i manage a domain on multiple platforms? Posted: 01 May 2020 11:59 PM PDT Hi all, I'm a sysadmin for a while now and I study hard to keep up and keep learning new things. I am by no means a networking expert. Today I ran into something that was really weird in my opinion. We host one of our domains at a Dutch supplier. We manually add and modify records and it's all fine. Because of some certificate issues in a webserver hosted at AWS, I was involved in that environment for the first time, and a colleague showed me around. Then, I noticed that they have multiple records for the same domain I host at my Dutch supplier, I only saw local records though. So, to the DNS guru's out there: how is it possible that one single domain has records at multiple domain hosters? [link] [comments]  |
| Am I missing something ? /32 subnet mask for PPPoE Posted: 02 May 2020 05:21 AM PDT Hey fellas, First post ever, so go easy on me. So I got my CCNA and got my first networking job. We have a small customer who bought a router from us and wishes to use it with their existing pppoe connection. They don't have their own IT, just a 3rd party support, and we asked them for the connection type so that we can pre-configure the router prior shipping. So according to them we need to set a static IP on the PPPoE interface but with the subnet mask of /32..? Since I'm a newbie , I did not want to question their network engineer, but even my colleagues were surprised (they are located in the US, so they are not really familiar with this type of "old connection"). Is there a gap in my knowledge regarding any speciality with pppoe or did the guy just made a typo and he wanted to write /30 for p2p connection ? Any comments are highly appreciated, thanks [link] [comments]  |
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