Networks

network connectivity issues – in the #homelab

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Yesterday a big storm came through. Many downed trees (photos here). The power went off at about 0500 and came back again at about 1009, off again at 1309, back at 1319. It was then stable for the rest of the day. Overnight, I saw monitoring alerts which initially made me think there was another power cut. uptime showed that was not the case. I also didn’t see any timeout messages meaning the […]

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Why don’t my hosts get IPv6 routes?

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I started this off as a post on FreeBSD Forums, but as I composed it, I decided it was better as a blog post. This post is most likely not useful to anyone. I solved the problem by rebooting the gateway. I never did find out the cause of the routing issue. Astute readers will recognized the IP4 and IPv6 addresses in this post – they are taken from RFCs which designate ranges

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When my home DHCP address changes, I want stuff done

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I recently moved from an appliance to a FreeBSD 14.2 gateway. In this post: FreeBSD 14.2 gw01 gw01 photos These are the main things I need done when my IP address changes: restart OpenVPN restart my Hurricane Electric IPv6 tunnel with the new IP address – written Tell HE.net about my IP address change – written Notify OpenDNS.com about my IP address change Update a dynamic DNS entry so my VPN clients can

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Creating a wireguard connection between my home and colo

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For years I’ve run the dev, test, and stage nodes for FreshPorts off servers in my basement. This meant that those hostnames have always pointed at my home IP address. I’d like to change that. I first started this using interactive commands (e.g. wg set) but found that approach unsatisfactory. I think directly editing the configuration file to be more intuitive and easily followed. I left my first approach up because it had

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Creating a wireguard connection between my home and colo – failed attempt

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NOTE: I wrote this, got stuck, then went a slightly different direction: I stopped using wg set Instead, I updated the configuration files directly I was not satisfied with the wg approach Although it is great for modifying things on the file, I don’t think it helps novices learn Wireguard I’m leaving it here anyway. Please use Creating a wireguard connection between my home and colo instead. None of these keys/IP addresses are

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Converting an iocage vnet jail to a vnet jail

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In this post I will be creating a ‘new’ jail which uses vnet. I say ‘new’ because I am actually Converting an iocage jail to a vanilla jail which happens to use vnet. NOTE: I originally failed to get this to work. You can read about it. I’m going to repost this article soon with a working solution. I won’t describe the process of creating the jail. Sorry. For the record: FreeBSD 12.2

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Creating a vnet jail

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In this post I will be creating a ‘new’ jail which uses vnet. I say ‘new’ because I am actually Converting an iocage jail to a vanilla jail which happens to use vnet. NOTE: HEADS UP: I failed to get this to work. I’m still going to post it though. What I did wrong: I should not have used ix1 – that’s the wrong NIC to use. This needs to use an active

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Listen queue overflow

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The R720 is showing a message like this from time to time: Jan 1 07:42:20 r720-01 kernel: sonewconn: pcb 0xfffff835e785d5b8: Listen queue overflow: 8 already in queue awaiting acceptance (1 occurrences) Jan 1 08:02:21 r720-01 syslogd: last message repeated 1 times Jan 1 08:27:22 r720-01 kernel: sonewconn: pcb 0xfffff835e785d5b8: Listen queue overflow: 8 already in queue awaiting acceptance (2 occurrences) Jan 1 16:07:04 r720-01 kernel: sonewconn: pcb 0xfffff835e785d5b8: Listen queue overflow: 8 already

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Adding IPv6 to an existing server

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I am adding IPv6 addresses to each of my servers. This post assumes the server is up and running FreeBSD 11.1 and you already have an IPv6 address block. This does not cover the creation of an IPv6 tunnel, such as that provided by HE.net. This assumes native IPv6. In this post, I am using the IPv6 addresses from the IPv6 Address Prefix Reserved for Documentation (i.e. 2001:DB8::/32). You should use your own

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kernel: arp: 10.55.0.62 moved from 78:ca:39:fe:d6:b3 to 14:99:e2:27:0f:48 on em0

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I started seeing this recently. It appears in the logs on my firewall: It does not seem to be disturbing anything, other than my nerves. The classical situation is: two PCs are arguing over the same IP address. Each NIC has a unique MAC address, used at the physical network segment. We often refer to IP addresses in a computer network that uses the Internet Protocol (IP) for communication. Let’s look closely at

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