# GRE Published articles for GRE. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## netlab 26.08: ArcOS, VPP (FD.io), ACLs, and DNS DevFeed: [netlab 26.08: ArcOS, VPP (FD.io), ACLs, and DNS]() Original publisher: [Read original article]() Published: 2026-08-10T09:58:00Z Content type: release Language: en Sources: [ipSpace.net blog]() Topics: [Release notes](), [networking](), [Containers](), [configuration](), [Routing (disambiguation)](), [Authorization]() Tags: [access-control](), [configuration](), [dns](), [getting-started](), [github](), [gre](), [installation](), [ipv4](), [ipv6](), [netlab](), [podman](), [release](), [release-notes](), [routing]() ### AI overview netlab 26.08 adds ArcOS support, VPP with FRR or BIRD control planes, SONiC containers, IPv4/IPv6 access control lists, DNS client and server configuration, GRE and WireGuard tunnel support, and Podman support for the clab provider. The article also notes bug fixes, configuration-template changes, upgrade guidance, and documentation for new users. ### Source excerpt netlab release 26.08 brings a few humongous additions: ArcOS support by @roc-ops VPP (FD.io) with FRR or BIRD control plane by @jbemmel SONiC containers (also by @roc-ops) IPv4/IPv6 access control lists in the routing module by @DanPartelly But wait, there's more: Read more ... ## Introducing the J2sw MTU and Encapsulation Calculator DevFeed: [Introducing the J2sw MTU and Encapsulation Calculator]() Original publisher: [Read original article]() Author: j2sw Published: 2026-07-28T16:37:53Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [Network](), [Tool](), [Ethernet](), [VXLAN]() Tags: [calculator](), [cisco](), [ethernet](), [fragmentation](), [gre](), [headers](), [ipsec](), [ipv4](), [ipv6](), [juniper](), [mikrotik](), [mpls](), [mtu](), [network-engineering-resources](), [network-tools](), [network-troubleshooting](), [overhead](), [payload](), [pppoe](), [vlan](), [vxlan]() ### AI overview The article introduces the J2SW MTU and Encapsulation Calculator, which estimates inner IP MTU and required underlay MTU for combinations of PPPoE, GRE, VLAN, MPLS, VXLAN, and other encapsulations. It explains how Layer 2 tags affect Ethernet frame size separately from IP MTU and describes overhead calculations, including cases where fragmentation can be avoided. ### Source excerpt Ever wondered what the effects of different combinations of PPPoE, GRE, and others have on the MTU of a packet? I am excited to announce the first of many J2 Network tools: the J2SW MTU and Encapsulation Calculator. You select the service MTU and the encapsulation used on the path. The calculator then works out ... Read more The post Introducing the J2sw MTU and Encapsulation Calculator appeared first on Justin Wilson (j2sw). ## netlab 26.07: GRE, Wireguard, Graceful Restart, and Scale-Out Labs DevFeed: [netlab 26.07: GRE, Wireguard, Graceful Restart, and Scale-Out Labs]() Original publisher: [Read original article]() Published: 2026-07-13T06:23:00Z Content type: release Language: en Sources: [ipSpace.net blog]() Topics: [releases](), [BGP](), [Server](), [evpn](), [VXLAN](), [configuration](), [GitHub]() Tags: [bgp](), [configuration](), [evpn](), [getting-started](), [github](), [gre](), [guide](), [installation](), [netlab](), [ospf](), [policy](), [release](), [releases](), [router](), [upgrade](), [vxlan]() ### AI overview The netlab 26.07 release adds scale-out labs through a multiserver plugin, GRE and WireGuard tunnel support, graceful restart capabilities, BGP policy roles, and expanded BIRD, FortiOS, MikroTik RouterOS, and OpenBSD functionality. It also removes the VirtualBox provider, makes BIRD v3 the default, and changes MikroTik RouterOS 7 BGP template syntax. ### Source excerpt The highlights of netlab release 26.07 include: The multiserver plugin by @muddyblack distributes containerlab devices across multiple servers. The GRE tunnel plugin supports GRE tunnels on Cisco IOS, FRR, VyOS, and Junos (vSRX and vJunos-router) (most device implementations done by @ssasso and @jbemmel). The WireGuard tunnel plugin by @jbemmel supports WireGuard tunnels on FRR. The bgp.session plugin and the OSPF module support graceful restart on Arista EOS, BIRD, FortiOS, and FRR (by @jbemmel and @a-v-popov) The bgp.policy plugin supports the bgp.role attribute on FRR and BIRD (by @jbemmel). But wait, there's more ;) Read more ... ## Technology Short Take 191 DevFeed: [Technology Short Take 191]() Original publisher: [Read original article]() Author: Scott Lowe Published: 2026-02-27T14:00:00Z Content type: article Language: en Sources: [Scott's Weblog]() Topics: [networking](), [Ansible](), [Security](), [Infrastructure as code](), [Artificial Intelligence](), [Large Language Model](), [Containers](), [VXLAN]() Tags: [ai](), [ansible](), [aws](), [blog](), [cilium](), [cli](), [cloud](), [cni](), [containers](), [cri-o](), [devops](), [docker](), [go](), [gre](), [iac](), [k8s](), [kubernetes](), [linux](), [llm](), [network-automation](), [networking](), [oci](), [security](), [vxlan]() ### AI overview Technology Short Take 191 is a curated collection of commentary and links covering networking, network automation, security, cloud management, containers, operating systems, applications, AI adoption, and software vulnerabilities. ### Source excerpt Welcome to Technology Short Take #191! This is my semi-regular collection of links related to technology disciplines, including networking, security, cloud computing, storage, and programming/development. I hope that I've managed to curate an interesting and useful set of links for readers. Enjoy! Networking I learned a new acronym from Ivan Pepelnjak in his article on "not so passive" OPSFv2 interfaces in Cisco IOS/XR: QDS (Quick and Dirty Solution). I am totally using that from now on. Via Ivan (hat tip to my colleague Russ for pointing me in this direction), I also learned that all is not well in network automation land with Ansible. Although some parts of it are apparently now resolved, this does raise questions about the viability of Ansible for network automation. Doug Dawson talks about the new Amazon Eero Signal, a cellular backup to a primary broadband connection for users using their Eero mesh systems. I agree with Doug--the pricing seems high to me. I generally like the Eero devices, although there have been times when I really could use a bit more control over the settings. Security The APNIC blog features a guest article discussing the use of tunneling protocols to infiltrate networks. The article specifically discusses Generic Routing Encapsulation (GRE) and Virtual Extensible LAN (VXLAN). It's worth a read if your network uses either of these technologies. Cloud Computing/Cloud Management Somewhere along the way I missed the CDK deprecation announcement. If I am not mistaken, this leaves Pulumi as the only cloud-independent IaC tool that lets you use a general purpose programming language. Managing dependencies between containers can be difficult at times; this blog post by Nicolas Fränkel introduced me to wait4x, a tool one can use to help simplify these types of situations. Operating Systems/Applications I appreciated reading Mitchell Hashimoto's AI adoption journey. I feel it does provide a more realistic approach to how someone in a role like his m ## On MPLS Paths, Tunnels and Interfaces DevFeed: [On MPLS Paths, Tunnels and Interfaces]() Original publisher: [Read original article]() Published: 2026-01-20T06:29:00Z Content type: opinion Language: en Sources: [ipSpace.net blog]() Topics: [Network](), [MPLS-TE](), [Routing (disambiguation)](), [IP routing](), [Protocol (disambiguation)](), [VXLAN]() Tags: [gre](), [ip-routing](), [mpls](), [network](), [networking-fundamentals](), [protocol](), [routing](), [vxlan]() ### AI overview The article explains the fundamental difference between overlay tunnels such as GRE, IPsec, and VXLAN and MPLS paths. Tunnels connect separate overlay segments across an underlay, while MPLS paths improve forwarding within the same network; routing protocols are used differently in these designs. ### Source excerpt One of my readers attempted to implement a multi-vendor multicast VPN over MPLS but failed. As a good network engineer, he tried various duct tapes but found that the only working one was a GRE tunnel within a VRF, resulting in considerable frustration. In his own words: How is a GRE tunnel different compared to an MPLS LSP? I feel like conceptually, they kind of do the same thing. They just tunnel traffic by wrapping it with another header (one being IP/GRE, the other being MPLS). Instead of going down the "how many angels are dancing on this pin" rabbit hole (also known as "Is MPLS tunneling?"), let's focus on the fundamental differences between GRE/IPsec/VXLAN tunnels and MPLS paths. Read more ... ## Why Are We Using EVPN Instead of SPB or TRILL? DevFeed: [Why Are We Using EVPN Instead of SPB or TRILL?]() Original publisher: [Read original article]() Published: 2024-04-05T06:17:00Z Content type: article Language: en Sources: [ipSpace.net blog]() Topics: [evpn](), [networking](), [VXLAN](), [IS-IS](), [Routing (disambiguation)](), [BGP]() Tags: [bgp](), [bridging](), [evpn](), [fabric](), [gre](), [is-is](), [mpls](), [network](), [routing](), [vxlan]() ### AI overview The article explains why EVPN, particularly with VXLAN encapsulation, became preferable to SPB and TRILL. It contrasts their encapsulation, control-plane, deployment, and transport requirements, and notes that VXLAN separates edge virtual networks from the physical transport core. ### Source excerpt Dan left an interesting comment on one of my previous blog posts: It strikes me that the entire industry lost out when we didn't do SPB or TRILL. Specifically, I like how Avaya did SPB. Oh, we did TRILL. Three vendors did it in different proprietary ways, but I'm digressing. Read more ... ## OSPF Summarization and Split Areas DevFeed: [OSPF Summarization and Split Areas]() Original publisher: [Read original article]() Published: 2024-03-12T06:39:00Z Content type: tutorial Language: en Sources: [ipSpace.net blog]() Topics: [networking](), [Routing (disambiguation)](), [Protocol (disambiguation)]() Tags: [gre](), [network](), [ospf](), [protocol](), [route](), [routing]() ### AI overview This tutorial explains how OSPF inter-area route summarization can cause traffic black holes when an area is split into disconnected fragments. It examines the failure scenario and describes disabling summarization or connecting the fragments with a GRE tunnel as possible fixes, while noting that virtual links do not solve this case. ### Source excerpt In the Do We Still Need OSPF Areas and Summarization? I wrote this somewhat cryptic remark: The routers advertising a summarized prefix should be connected by a path going exclusively through the part of the network with more specific prefixes. GRE tunnel also satisfies that criteria; the proof is left as an exercise for the reader. One of my readers asked for a lengthier explanation, so here we go. Imagine a network with two areas doing inter-area summarization on /24 boundary: Read more ... ## A peek at OpenStack Neutron DevFeed: [A peek at OpenStack Neutron]() Original publisher: [Read original article]() Published: 2017-10-06T00:00:00Z Content type: tutorial Language: en Sources: [Gaurav Sarma's Blog]() Topics: [openstack](), [networking](), [virtual machines](), [Cloud]() Tags: [cloud](), [datacenter](), [gre](), [linux](), [networking](), [networks](), [nova](), [openstack](), [virtual-machines](), [vlan](), [vxlan]() ### AI overview This tutorial examines OpenStack Neutron, its networking service, and how it differs from the legacy Nova networking service. It introduces Linux networking concepts and describes network types including local, flat, VLAN, and VXLAN/GRE overlays, along with Linux Bridge and OVS plugins. ### Source excerpt From the OpenStack official [website](https://www. openstack...