How Did Big Tech Celebrate Earth Day 2020?
Cisco, Google, IBM, Intel, and Microsoft stepped up their Earth Day commitments, promising...
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MUST READ: When Programming a System with High Kinetic Energy
Kode Vicious (aka George V. Neville-Neil ) wrote another brilliant article on reducing risk in systems that can do serious harm. Here are just two of the gems:
The risks involved in these systems come from three major areas: marketing, accounting, and management.
There is a wealth of literature on safety-critical systems, much of which points in the same direction: toward simplicity. With increasing complexity comes increasing risk …
For whatever reason most networking- and virtualization vendors joined a lemming-like run in the opposite direction years ago.
EVPN-VXLAN | Virtual Gateway |QFX5k Forwarding | JUNOS
In this post, I want to discuss how to verify Virtual Gateway forwarding behaviour on Broadcom based Juniper QFX switches.
The general assumption with EVPN Anycast Gateway is that gateway flows are load-balanced across all gateway devices. And whilst EVPN provides the mechanism to support this behaviour, there is a requirement for the forwarding hardware to also support it.
The mechanism for an EVPN device to load balance gateway flows is to install the virtual gateway ESI as a next-hop for the virtual gateway MAC address. However, Broadcom based QFX switches do not support this behaviour and can only install a single VTEP as a next-hop. So this means that traffic flows heading towards the virtual gateway will only ever traverse via a single gateway device. This behaviour is well documented and there are some talks about Broadcom working with the vendors to improve gateway load-balancing with ESI functionality.
Now we understand the characteristics, let’s look at the steps to verify forwarding behaviour on a Broadcom based QFX switch. Here we’ll look at how to identify which VTEP is being used to reach the virtual-gateway MAC address and how the underlay is transporting the traffic.
Lab Setup
The lab setup Continue reading
SD-WAN Complexity Remains Adoption Burden, Says Aryaka
According to the vendor's latest annual survey, 37% of respondents named complexity as their No. 1...
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Interview: Impact of COVID-19 on Networking Engineers and Public Cloud
Ben Friedman and his team (the video crew producing all the Tech Field Day events) published a number of interviews about the impact of COVID-19 on IT.
Among other things we discussed how busy networking engineers are trying to cope with unexpected demand, and how public cloud isn’t exactly infinitely elastic.
Juniper Branch SRX LACP Weirdness
Juniper SRX 300 Series firewalls may stop forwarding traffic in some situations. The firewall says it is forwarding the traffic, but it doesn’t work. Monitoring traffic looks OK, ARP entries are present, but traffic never gets to the destination, until you clear ARP. Turns out the problem comes from using LACP with fast timers and active mode. Luckily the fix is simple.
Alert: Firewall Offline
Here’s the situation we saw: Our NMS reported a Juniper SRX320 offline. All other devices at the site were still working, but the firewall was unreachable. Traffic from the firewall to the NMS goes via the firewall’s default gateway. Firewall A in this diagram was unreachable, but Firewall B was fine.
OK, what’s happening? Why is my firewall unreachable?
Firewall says its fine?
Try to ping Firewall A, no response. From the default gateway, we can see an ARP entry for the firewall, but no response to ping. We can log in to Firewall B, and we see an ARP entry for Firewall A. Crucially: we can ping Firewall A from Firewall B. Hmmm. That’s strange. Why can we ping it from one locally connected device but not another?
From Firewall B, we SSH across Continue reading
Juniper Branch SRX LACP Weirdness
Juniper SRX 300 Series firewalls may stop forwarding traffic in some situations. The firewall says it is forwarding the traffic, but it doesn’t work. Monitoring traffic looks OK, ARP entries are present, but traffic never gets to the destination, until you clear ARP. Turns out the problem comes from using LACP with fast timers and active mode. Luckily the fix is simple.
Alert: Firewall Offline
Here’s the situation we saw: Our NMS reported a Juniper SRX320 offline. All other devices at the site were still working, but the firewall was unreachable. Traffic from the firewall to the NMS goes via the firewall’s default gateway. Firewall A in this diagram was unreachable, but Firewall B was fine.
OK, what’s happening? Why is my firewall unreachable?
Firewall says its fine?
Try to ping Firewall A, no response. From the default gateway, we can see an ARP entry for the firewall, but no response to ping. We can log in to Firewall B, and we see an ARP entry for Firewall A. Crucially: we can ping Firewall A from Firewall B. Hmmm. That’s strange. Why can we ping it from one locally connected device but not another?
From Firewall B, we SSH across Continue reading
Untangle Rolls Out Predictive Routing to SD-WAN Router
The technology is designed to translate information from packet headers, out of band information,...
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WiFi 6 Feeds Need for Speed With 5X Spectrum Boost
It’s the largest swath of spectrum allocated for WiFi since 1989, and it comes as WiFi 6 begins...
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Daily Roundup: AT&T Selects Stankey as New CEO
AT&T selected Stankey as new CEO; Verizon claimed its 5G is COVID-19 proof; and Intel posted...
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Heavy Networking 513: How The Internet Is Handling The Covid-19 Load
Today's Heavy Networking looks at the impact of Covid-19 on Internet usage and capacity with two guests who have front-row views: Neil McRae, Senior Leader at British Telecom; and Dave Temkin, VP of Infrastructure at Netflix.
The post Heavy Networking 513: How The Internet Is Handling The Covid-19 Load appeared first on Packet Pushers.
Heavy Networking 513: How The Internet Is Handling The Covid-19 Load
Today's Heavy Networking looks at the impact of Covid-19 on Internet usage and capacity with two guests who have front-row views: Neil McRae, Senior Leader at British Telecom; and Dave Temkin, VP of Infrastructure at Netflix.Intel Posts Strong Q1 Earnings, Warns of Q2 Headwinds
Despite pandemic related challenges, Intel reported revenues of $19.8 billion for the quarter, up...
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Verizon Claims 5G Plans Immune to COVID-19
Verizon’s 5G network was live in 34 U.S. cities at the end of the quarter, and CEO Hans Vestberg...
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AT&T CEO Shake Up Sees Stephenson Out, Stankey In
The move comes on the heels of AT&T’s most recent quarterly earnings release that was...
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Blessay: Coin-Operated Evangelism
This article was first published in Packet Pushers Human Infrastructure Magazine. An email newsletter that talks about being a human in technology. You can subscribe, for free here. I struggle with the concept of ‘corporate evangelism’. So here are some thoughts on the topic. Religious Roots Evangelism is a religious principle that your belief is […]
The post Blessay: Coin-Operated Evangelism appeared first on EtherealMind.
Eventually Secure?
I have a Disney+ account. I have kids and I like Star Wars, so it made sense. I got it all set up the day it came out and started binge watching the Mandalorian. However, in my haste to get things up and running I reused an old password instead of practicing good hygiene. As the titular character might scold me, “This is not the way.” I didn’t think anything about it until I got a notification that someone from New Jersey logged into my account.
I panicked and reset my password like a good security person should have done in the first place. I waited for the usual complaints that people had been logged out of the app and prepared to log everyone in again and figure out how to remove my New Jersey interloper. Imagine my surprise when no one came to ask me to turn Phineas and Ferb back on. Imagine my further surprise when I looked in the app and on the Disney+ website and couldn’t find a way to see which devices were logged in to this account. Nor could I find a way to disconnect a rogue device as I could with Netflix Continue reading