Introduction to DHCP (Dynamic host configuration protocol)
Well Routers, servers, other key nodes require specific or static IP address and Clients can use an IP from a pool of available addresses. Minimum host configuration for Internet:
- IP address
- Subnet mask
- Default gateway
- DNS server IP
DHCP allows network administrator to assign a pool of available IP addresses for clients with additional configuration information such as default gateway, DNS IP, WINS IP, domain names
Addresses are leased, Cisco default is 24 hours
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| Fig 1.1- DHCP Server |
DHCP process
· Client boots up, sends a DHCPDISCOVER broadcast
· All available DHCP servers respond with DHCPOFFER containing proposed IP address, lease time, DNS IP; server checks that IP offered is not in use before making the offer by issuing a default 2 pings
Worth Reading: Is More Technology Good for Your Business?
Gian Paolo Boarina published a great article following my Are You Solving the Right Problem rant.
Long story short: everyone in the networking game has their own agenda, and it’s not necessarily good for you or your business.
Red Hat Updates Container Storage Platform as Market Strives for Maturity
The update allows customers to manage, scale, and upgrade their storage needs using a single control plane.
“Keep those eyebrows up!” – Cybersecurity at the Global Women’s Forum
News of cyberattacks is slowly becoming a new normal. We are still at a stage where high-profile cases, like the recent attack against the American credit reporting company Equifax, in which 145.5 million users had their personal information compromised, raise eyebrows. But we need those eyebrows to stay up because we should never accept cyber threats as the new normal.
This week in Paris, hundreds of leaders met at the Women’s Forum to discuss some of the key issues that will shape the future of a world in transition, including cybersecurity. But this topic is not just a concern for the experts – it’s a concern to all men and women leading any business today.
New risks on the horizon
A recent report by the Internet Society, “Paths to Our Digital Future”, points out that now is a big moment for the Internet. The revolution we already see could accelerate in the coming years, not only due to the increasing digitalization of services and businesses, but also through the expansion of objects being connected to the Internet – the Internet of Things (IoT). By 2020 more than 20 billion “things” could be connected.
Suddenly it’s not only Continue reading
SDxCentral Weekly News Roundup — October 6, 2017
BT and SK Telecom partner with the Telecom Infra Project; CenturyLink and Level 3 merger gets DOJ approval.
Gartner Survey: CIOs Move from Cost Savers to Revenue Generators
For 2018, 26 percent of CIOs say growth is their number one priority.
Nokia Using Startup Pensa’s Automation Software
The SaaS spins up virtual data centers “within minutes.”
Telenor, Cisco Launch Mobile-Focused Neutral Cloud Platform
WG2 is looking to bring cloud ecosystems closer to mobile telecom operators.
Show 360: All About Optics With InterOptic (Sponsored)
On today's sponsored Weekly Show, InterOptic CEO Tim Dixon joins the Packet Pushers for a lively discussion about the world of optics. The post Show 360: All About Optics With InterOptic (Sponsored) appeared first on Packet Pushers.
Traceroute Lies! A Typical Misinterpretation Of Output
Sometimes a user with performance issues will proudly present me with a traceroute and point to a particular hop in the network and accuse it of being the problem because of high latency on the link. About 1 time in 1000 they are correct and the link is totally saturated. The other 999 times, well, let me explain.
Traceroute Output
Here’s a typical traceroute I might be sent by a user (IPs and hostnames are altered to protect the innocent):
$ traceroute www-europe traceroute to www-europe (18.9.4.17), 64 hops max, 52 byte packets 1 gateway (57.239.196.133) 11.447 ms 18.371ms 25.057 ms 2 us-atl-edge (137.16.151.202) 13.338 ms 20.070 ms 19.119 ms 3 us-ga-core (57.239.129.37) 103.789 ms 105.998 ms 103.696 ms 4 us-nyc-core (57.239.128.189) 107.601 ms 103.116 ms 103.934 ms 5 us-east-core (57.239.13.42) 103.099 ms 104.215 ms 109.042 ms 6 us-east-bb1 (57.239.111.58) 107.824 ms 104.463 ms 103.482 ms 7 uk-south-bb1 (57.240.117.81) 106.439 ms 111.156 ms 104.761 ms Continue reading
Back In The Saddle Of A Horse Of A Different Color
I’ve been asked a few times in the past year if I missed being behind a CLI screen or I ever got a hankering to configure some networking gear. The answer is a guarded “yes”, but not for the reason that you think.
Type Casting
CCIEs are keyboard jockeys. Well, the R&S folks are for sure. Every exam has quirks, but the R&S folks have quirky QWERTY keyboard madness. We spend a lot of time not just learning commands but learning how to input them quickly without typos. So we spend a lot of time with keys and a lot less time with the mouse poking around in a GUI.
However, the trend in networking has been to move away from these kinds of input methods. Take the new Aruba 8400, for instance. The ArubaOS-CX platform that runs it seems to have been built to require the least amount of keyboard input possible. The whole system runs with an API backend and presents a GUI that is a series of API calls. There is a CLI, but anything that you can do there can easily be replicated elsewhere by some other function.
Why would a company do this? To Continue reading
Google, Barefoot Networks Add Legs to P4 with Runtime API
P4 Runtime overcomes SDN shortfall of a programmable forwarding plane.
Level 3 Expands Its Network Security in APAC, Africa
The security platform is designed to be compatible with SD-WAN.
A Fast, Secure Migration to Google Cloud Platform using Cloudflare
OnAir Video Presentation
Abstract
Looking to host your website, application, or API in the cloud, or migrate to a new cloud provider while keeping your data secure? In this webinar, Trey Guinn, Head of Solutions Engineering at Cloudflare, will discuss how companies should approach security, during and after migration. We'll highlight the migration story of LUSH, one of the largest global e-Commerce cosmetic retailers, and how they took the right steps to migrate from their previous cloud provider to Google Cloud Platform, in less than 3 weeks. Trey will be performing a live demo on setting up Cloudflare load balancing across cloud providers, as well as
Speakers
Asad Baheri
Security & Networking Partner Manager
Google Cloud Platform
Trey Guinn
Head of Solutions Engineering
Cloudflare
Webinar Transcription and Load Balancing Demo
Asad Baheri
Today we're going to talk about LUSH's migration to Google Cloud and how Cloudflare, one of our top security and performance partners, can help you with your own cloud migration. Throughout our presentation, we'll be talking about security best practices, how CDNs and the CDN Interconnect program works, and we're also going to also give you a demo of Cloudflare's load balancing to start your migration.
One of Continue reading
IPv6, DNSSEC, Security and More at ION Malta
The Deploy360 team is back from ION Malta, which took place on 18 September alongside an ICANN DNSSEC Training Workshop. We again thank our sponsor Afilias for making this possible, and are now working toward our final ION Conference of the year, ION Belgrade in November. All the presentations from ION Malta are available online.
I opened the event with an introduction to Deploy360 and an invitation for everyone to get involved with the Internet Society’s 25th anniversary the next day. We also heard from Jasper Schellekens, the president of the ISOC Malta Chapter about their activities and how to get more involved. They have a small but mighty presence in Malta and are looking forward to getting more members and increasing their activity.
Next, Nathalie Trenaman from RIPE NCC gave a fascinating presentation on the status of IPv6 in Malta. Unfortunately, IPv6 penetration in Malta is extremely low, but ISPs are transferring IPv4 address space around and, interestingly, have purchased over 30,000 IPv4 addresses from Romania. She encouraged ISPs to begin moving to IPv6 now, as RIPE NCC estimates that full transition takes about 2.5 years to complete.
Next up, Klaus Nieminen from the Finnish Communications Continue reading
DDoS Protection: Arbor Networks vs. Kentik
IT pros cite pros and cons of two products that shield the network against DDoS attacks.