AN(4)

🌸 AN(4) — bestie, let me tell you about the an driver 🌸

okay so this is the manual page for AN(4) — the Aironet 4500/4800 and Cisco 340/350 series wireless network driver. it's giving vintage Wi-Fi realness and honestly? iconic.

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✨ NAME ✨

an — the Aironet 4500/4800 and Cisco 340/350 series wireless network driver. no cap, that's the whole vibe.

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✨ SYNOPSIS ✨

so here's how you attach this thing to your system — three whole ways, pick your fighter:

an* at pcmcia? function ?
an* at pci? dev ? function ?
an* at isapnp?

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✨ DESCRIPTION ✨

okay so the an driver is literally the support system for Aironet Communications 4500/4800 and Cisco Aironet 340/350 series wireless network adapters. we're talking the ISA, PCI and PCMCIA varieties — the whole squad. the 4500 series adapters operate at 1 and 2Mbps (retro vibes) while the 4800 series and 340/350 series can operate at 1, 2, 5.5 and 11Mbps — highkey better. the ISA, PCI and PCMCIA devices are all based on the same core PCMCIA modules and all have the same programming interface, which is super convenient. BUT — and this is the tea — unlike the Lucent WaveLAN/IEEE cards, the ISA and PCI cards appear to the host as normal ISA and PCI devices and do not require any PCMCIA support. so no extra drama there.

the PCMCIA Aironet cards do require PCMCIA support (obvi). ISA cards can either be configured to use ISA Plug and Play or to use a particular I/O address and IRQ by properly setting the DIP switches on the board. (the default switch setting is for plug and play, so if you don't touch anything you're fine 💅). the an driver has Plug and Play support and will work in either configuration, however when using a hard-wired I/O address and IRQ, the driver configuration and the NIC's switch settings must agree — like, they have to be in sync or it's not gonna slay. PCI cards require no switch settings of any kind and will be automatically probed and attached. easy.

all host/device interaction with the Aironet cards is via programmed I/O. the Aironet devices support 802.11 and 802.3 frames, power management, BSS (infrastructure) and IBSS (ad-hoc) operation modes — versatility queen. the an driver encapsulates all IP and ARP traffic as 802.11 frames, however it can receive either 802.11 or 802.3 frames. transmit speed is selectable between 1Mbps, 2Mbps, 5.5Mbps, 11Mbps, or “auto” (the NIC automatically chooses the best speed — main character energy).

by default, the an driver configures the Aironet card to join an access point with an SSID of null string. for ad-hoc mode, in which stations can communicate among each other without the aid of an access point, the driver must be set using ifconfig(8) — you gotta do it manually, bestie.

for more information on configuring this device, see ifconfig(8) and ifmedia(4). they're the real MVPs.

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✨ HARDWARE ✨

cards supported by the an driver include — let's go through the lineup:

• Aironet 4500 Series 🎀
• Aironet 4800 Series 🎀
• Cisco Aironet 340 Series 🎀
• Cisco Aironet 350 Series 🎀

that's the whole roster. all iconic.

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✨ DIAGNOSTICS ✨

okay so when things go wrong, the driver has some things to say. here's the tea:

• an%d: init failed — the Aironet card failed to come ready after an initialization command was issued. she ghosted us. rude.
• an%d: failed to allocate %d bytes on NIC — the driver was unable to allocate memory for transmit frames in the NIC's on-board RAM. tragic, no memory no vibes.
• an%d: device timeout — the Aironet card failed to generate an interrupt to acknowledge a transmit command. she simply didn't respond, not slay.

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✨ SEE ALSO ✨

if you wanna learn more (and you should), go check these out:

• arp(4)
• ifmedia(4)
• netintro(4)
• ifconfig(8)

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✨ HISTORY ✨

the an device driver first appeared in FreeBSD 4.0, and then in NetBSD 1.6. vintage but still relevant, iykyk.

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✨ AUTHORS ✨

the an driver was written by Bill Paul <wpaul@ee.columbia.edu> — a whole legend. periodt.

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this page was brought to you by Debian, December 13, 2000, and the manual name is AN(4) — hope you learned something bestie, fr fr 💖✨🦋