Posts

After almost 20 years at Bowdoin College, I’ve decided to move on. This has been one of the most difficult decisions of my professional career. I thought it might be nice to mark this milestone – or is “fork in the road” a better metaphor? – with a bit of a retrospective of the projects I have initiated, led, and been involved in. In short, this has been a way for me to reflect on my experiences and process this life transition....

I have been working on rearchitecting our backup cloud connectivity and am considering using Megaport’s cloud router (MCR) product. I’ll post again in the future with more details of the design and its implementation, but I wanted to write a short note of appreciation about Megaport’s provisioning interface. They provide a complete self-service portal and REST API. In addition, they provide a separate “staging” portal and API, where “all actions mirror the production system, but services will not be deployed and you will not be billed for any activity....

Summary Over the past few months, I’ve been part of a project team to migrate an on-premises IP PBX to the Microsoft Teams cloud-based phone system. One component of this project is the Enhanced 911 (E911) service. E911 enables the capability to automatically provide the location information of the caller to the Public Safety Answering Point (PSAP) when an emergency call to 911 is placed. Any multi-line phone system implemented today must provide dispatchable location information....

Background In a recent upgrade of our monitoring infrastructure, I moved network monitoring off of physical hardware and onto virtual machines running on our VMware infrastructure. The migration was completely successful except for one small issue: clock drift. One of the many data points we monitor on servers and network gear is whether their configured time is in sync with the rest of the infrastructure. This is done by querying their current time (usually via NTP), and comparing it to the local monitoring server’s clock (also synced via NTP)....

Overview What is BFD? Bidirectional Forwarding Detection (BFD) as defined in RFCs 5880 and 5881 is a protocol to detect network faults between the forwarding planes of two network devices. It is designed as a low-overhead protocol that can run over media that may not have built-in failure detection, including Ethernet, tunnels, and MPLS LSPs. Multiple control plane protocols can subscribe to a BFD session to be notified when connectivity is interrupted....

Overview NetBox is a DCIM and IPAM tool for modeling infrastructure and serving as a source of truth for the desired state of the network. Okta is an IAM company that offers a single sign-on product, which can act as a central point to manage user access. As of NetBox version 3.1.0, native support for SSO authentication was added via inclusion of python-social-auth. This library supports many backends, including Okta via both OAuth2 and OpenId Connect....

Another engineer reported that “TFTP is not working” when he was trying to stage firmware upgrades on our Cisco access network. I offered to help, and ended up spending a good portion of a day troubleshooting it. Replicate the Issue Fortunately, we have lab gear that I could test this on without affecting any production service. I logged into a 3850 stack in the lab and successfully transferred a test file from a TFTP server on a bastion host....

I needed to troubleshoot a pesky OSPF issue on a new network. It turned out it was a simple fix, but had tripped up a couple other network engineers so I thought I’d lab it up and document the scenario. The problem The reported issue was that a network that was part of the OSPF process was not showing up in the routing table. Adjacencies between all routers were up and the network in question was shown in the OSPF database....

Overview An application problem was brought to me to troubleshoot. From the symptoms I observed, I was confident that the problem was an intermittent issue with the SAAS provider’s DNS. To prove this assertion, I needed to collect a packet capture of failed query. This post details the process I went through to collect that data. Investigation When the problem was reported, we saw our recursive nameservers returning NXDOMAIN in response to queries for the domain, when manual queries (with dig) directly to the provider’s nameservers returned valid data....

Timo Reimann wrote a handy NetBox plugin to collect and display support expiry information (End-of-Sale, End-of-Support, etc.) as well as the current Contract and Warranty coverage dates for all Cisco devices defined in a NetBox installation. His README does a good job showing the process for setting up the plugin, so I won’t repeat all the details here. The general process is: register an app with Cisco and obtain the API ID and secret....

NetBox has an available integration with the NAPALM automation library. For supported devices, the NetBox device view will show additional tabs for status, LLDP neighbors, and device configuration. It will also proxy any (read-only) napalm getters (get_environment, get_lldp_neighbors, etc.) via the REST API. The basic configuration outlined in the documentation assumes that the NetBox server has direct ssh access to these devices. That is not the case if you use a bastion host or jump host....

While trying to wrap my head around some of the NetBox database relationships, I found myself wishing for a database schema diagram. I looked through the documentation and code repo, but didn’t find anything. A colleague recommended trying schemaspy, so I tried it. Setup I set up a fresh install of netbox on a Debian 10 VM, and downloaded schemaspy and its dependencies. Alternatively, they publish a Docker image. Install Java sudo apt install dfault-jdk JDBC Driver PostgreSQL has a download page for the JDBC driver....

Motivation In migrating our NOC website to from a traditional Apache server to a serverless architecture, I’ve needed to update or replace any dynamic components. For example, replacing a Wordpress installation with Hugo to publish static content to a S3 bucket served by CloudFront. In this particular case, it was a CGI script that reads our firewall configurations and presents a web page for visualizing and searching the many object-groups and access-lists....

Background In the last post, I documented an approach to fan-out GitHub repository updates to AWS services using API Gateway, Lambda, and SNS. In my conclusion, I wrote: The whole time I was building and testing this, I kept thinking to myself, “I must be overlooking a more obvious solution.” I’ve asked around, and it seems that others have also run into this issue, but ended up using a different approach that didn’t involve authorization....

Motivation and Design I have a bunch of “audit scripts” that run against the network configurations (and other data sources, such as DNS and DHCP) to check for common problems, mistakes, and inconsistencies. They run on a centralized server that periodically fetches the latest data from all these sources, runs the scripts, and emails about any discrepancies. This data sources are kept in git repositories, either updated by operations staff, or automatically....

I had an interesting design requirement for a network monitoring host. These monitoring hosts, or collectors, are used to monitor our network from an external perspective – via the Internet. They also needed to be reachable from our internal network for central management, and needed access to shared internal services, such as directory services, time servers, and central logging. Design My initial approach was to deploy the hosts in a public subnet, set the default route over the Internet, and add individual host routes via the transit gateway to the subnet routing table....

Summary I have deployed some Azure SQL Managed Instances using Terraform. Since there are no native resources for this service in the Azure provider, I used an Azure Resource Manager deployment template. Recently, I had to add an output to that template (so that another workspace could set up remote logging), and wanted to note my experience with updating deployment templates from Terraform. Here, I’ll detail the original design and then walk through the update process....

Single-homed SBC In planning to migrate phone traffic from PRI to SIP, we decided to use an existing pair of session border controllers (SBCs) that were already in production for another (smaller) deployment. Before cutting over the whole organization’s voice traffic, I revisited the (3-year old) network design. While the two SBCs are in separate datacenters in separate buildings, each SBC is only single-homed. This means that there is SBC high-availability in terms of new calls, but existing calls will be dropped if there is a failure or maintenance on the switch....

The problem A common AWS connectivity design is to have a direct connect (DX) connection with a VPN backup. There are some routing concerns to consider when implementing this design to make sure that traffic prefers the DX circuit and only uses the backup VPN path if the DX is unavailable. Traffic from AWS transit gateway (TGW) will always prefer the direct connect gateway (DXGW) path, but traffic in the other direction (to AWS) is dependent on the customer gateway (CGW) routing policy....

Introduction AWS has made much progress over the years with IPv6 support. From S3, EC2, Cloudfront, Route53, and EC2 support back in 2016, to more recent updates to NLB and the EC2 API, I’ve appreciated every advancement and patiently waited for the next. Unfortunately, there are still pieces missing that prevent me from making full use of IPv6 in my employer’s current environment. Existing architecture The architecture is modeled after one of AWS’s recommended connectivity designs....