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Tag Archive 'ipv6'

PSA: no IPv6 on Cisco SPA122

If you’re like me and care about IPv6 and want an analog telephone adapter for your BBS, you want a Cisco ATA 191/192 instead of a Cisco SPA 121/122. I forget why I bought the SPA 122 after I bought an ATA 191 and needed more ports, I guess to compare them or the 122 […]

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My colleague Matthew gave a presentation about bare metal provisioning servers at Facebook on IPv6-only networks at SREcon last month. He discusses the entire process from why we went v6-only, selection of DHCP server and network boot loaders, through installing CentOS on hosts, and all of the gotchas along the way. By audience survey it […]

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It turns out my SuperMicro A1SAI boards made a fucking liar out of me. I bitched and moaned it was 2016 and they didn’t support UEFI PXE booting despite supporting UEFI, but they do. I just didn’t know where to look. Under “PCIe/PCI/PNP Configuration” in boot setup, the “Launch Storage OpROM Policy” and “Launch Network OpROM […]

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If you have Mellanox ConnectX-3 or ConnectX-4 NICs in your servers, I discovered it’s possible to do IPv6 OS installations via PXE. FlexBoot is their on-board PXE implementation that ships on their NICs and it’s based on iPXE. It turns out that as of FlexBoot version 3.4.718 from January 2016 they’ve added beta IPv6 support. […]

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ASRock Rack C2550D4I motherboard

I wanted a new Avoton motherboard for my OpenIndiana home NAS with lots of on-board SATA so I could use the PCIe slot for a 10-gigabit NIC. I needed seven SATA ports, six for the data disks and one for the OS drive. The standard mini-ITX configuration seems to max out at six, and I […]

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  The Anaconda 19 (now v21) installer in RHEL 7 / CentOS 7 is a great improvement over Anaconda 13 that was used in CentOS 6. Among other fixes it was completely overhauled along the way. One thing lacking in CentOS 6 was the ability to perform an automatic kickstart installation over an IPv6-only network. […]

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June rocks

June was such an exciting month and the good news over summer keeps getting better: People finally wise up and take down the Confederate flag (the “rebel flag” where I grew up) The US Supreme Court allows gay marriage (whether or not they hijacked diplomacy is another thing) ESA’s Philae comet lander makes contact with Rosetta […]

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If you’re like me, you have a home LAN filled with various contraptions, computers, mobile devices and the ubiquitous server in the closet. Usually there’s no DNS zone containing your home devices, if anything, maybe a static /etc/hosts entry on your desktop to give a short hostname to your closet server. Otherwise, people just use […]

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I discovered today there’s a way to bring IPv6 connectivity to your iPhone, even if you don’t have v6 wifi nor v6 cellular data.  There’s a Cisco AnyConnect client for iPhone which speaks SSL VPN (TLS/DTLS) to an ASA.  The release notes say “Access to internal IPv4 and IPv6 network resources”. I take this to […]

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My host’s home network is behind NAT, has no 6to4 connectivity and the router squashes IP protocol 41 (6in4). Normally in this situation I’d fire up a Teredo tunnel, but here it’s pretty unreliable.  My control traffic to Microsoft’s Teredo server goes to Singapore, and who knows where my closest Teredo relays are. After some […]

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