NETem – Network Link Emulator for GNS3
The NETem emulates a network link, typically a WAN link. You can configure parameters like bandwidth limitation, delay, jitter and packetAn EIGRP Scaling Puzzle
This last week I received an email from a friend asking about scaling. The situation is this: a particular company has well over 100 EIGRP routers on a single L2 service from a provider. Will this scale? What’s more interesting than simply asking about scale, though, is to ask the “why” question — no matter […]
The post An EIGRP Scaling Puzzle appeared first on Packet Pushers.
Cisco Targets SMBs In WLAN War With HP/Aruba
Cisco's new WLAN product, Mobility Express, targets customers who want simple deployment, and gives Cisco a weapon against HP/Aruba.
The post Cisco Targets SMBs In WLAN War With HP/Aruba appeared first on Packet Pushers.
DHCP Details You Didn’t Know
If you’ve been a networking engineer (or a sysadmin) for a few years, you must be pretty familiar with DHCP and might think you know everything there is to know about this venerable protocol. So did I… until I read the article by Chris Marget in which he answers two interesting questions:
- How does the DHCP server (or relay) send DHCP offer to the client that doesn’t have an IP address (and doesn’t respond to ARP)?
- How does the DHCP client receive the DHCP responses if it doesn’t have an IP address?
Risky Business #384 — Mark Dowd talks AirDrop pwnage, XCode iOS scandal
We've got a great show for you this week. Mark Dowd drops by to talk about the recent spate of Trojaned iOS apps that made it into Apple's China App Store. We also talk to him about his awesome AirDrop bug. How did it work?
This week's sponsor segment is actually a real cracker. Context IS consultant David Klein tells us how he owned an entire cloud platform by enumerating some shitty 90s-style bugs in some third party libraries they were using. It's comedy gold. This cloud platform that uses security at a selling point. It's bad.
Networking Field Day 10 – Arista
I finally had the chance to finish watching all of the Arista videos from Networking Field Day 10. They did quite a few presentations and if you haven’t watched them yet I would recommend you do…
While the bulk of the videos talked about Arista platforms or features, Ken Duda’s presentation (EOS Evolution and Quality) really struck a chord with me. Early in the presentation Ken summarizes the problem by saying “when the network ain’t working, ain’t nothing working”. The software powering your network just has to work and it has to work consistently. Ken then goes into where he thinks quality should come from breaking it into 3 pieces.
Culture – It’s obvious from Ken’s talk that Arista legitimately cares about software quality. While I don’t think this is unique to Arista, I think it’s something they’ve fully embraced because they can. Arista was born out of the commodity network era. When you are working with commodity chips, the real differentiator becomes software. This puts them at a unique position compared to other traditional vendors who Continue reading
Cisco in China: If You Can’t Beat ‘Em, Join ‘Em
Having struggled in China since Snowden, Cisco is taking a new tack.
Opengear Saves the Day from 35K Feet
On Tuesday, I was boarding a flight heading to the west coast and realized I had 3 switches powered down in the colo that I needed for a presentation and demo on Wednesday. Not a good feeling.
We have an IP enabled PDU that I usually connect to with no issues from the office and home office since we also have an SD-WAN deployed using Viptela. The only issue — there is not a way to VPN into the colo (yes, that’s my fault).
As it turns out, I had exposed the Opengear console server, that we used for all out of band access, to the Internet a few months prior. On a flight that I was only planning to do offline work, I was forced to purchase Wifi…from there, the fix was pretty simple.
I SSH’d into the Opengear console server, got access to the Juniper SRX perimeter FW, and then added a temporary NAT configuration that exposed the PDU to the Internet. I was able to now access the PDU directly from 35K feet in the air, get the devices powered up, and have some peace that they could be used in the demo. Sure, I could have Continue reading
ONF Debuts Northbound Interfaces for Intent-Based Networking
The intent-based Boulder & Aspen projects are designed to open up networking.
Increased Security Spending: Good Money After Bad?
A couple of recent analyst reports tout significant growth in the information security market. But More security spending on products doesn’t necessarily mean better outcomes for customers.
The post Increased Security Spending: Good Money After Bad? appeared first on Packet Pushers.