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====== Information ======

  * [[https://www.linksys.com/id/p/p-ea6350/|Linksys EA6350]]
  * [[https://openwrt.org|OpenWrt]]
  * [[https://openwrt.org/toh/linksys/ea6350_v3|OpenWrt Device Page]]
  * [[https://openwrt.org/releases/snapshot|Snapshot]]

===== Notes =====

  * 2021/07/02: :!: When using Oculus Air Link and a speed test at 60Mbps download, CPU 0 is around 75% load and the other 3 are 1-5%. Packet Steering is disabled by-default and doesn't seem to do anything when enabled. irqbalance spreads the load quite nicely and drops CPU 0 in the same situation to around 20%. Presumably, if ISP speeds increase beyond 60Mbps, irqbalance will be required.
  * 2021/08: For 5GHz, the wireless channels chosen needs to do 30 dBm on both 2.4GHz and 5GHz. For 5GHz, 149 works fine.
  * :!: 2024/05/13: Wrong polarity on power barrel will fry the router/require hardware repair ([[https://discussion.fedoraproject.org/t/i-rebuilt-my-nas-and-also-powered-my-whole-network-from-molex/117002|post]])

====== Snapshot ======

==== Links ====

  * :!: 2022: OpenWRT snapshot builds were disabled at some point, see https://github.com/openwrt/openwrt/pull/11405

  * [[https://downloads.openwrt.org/snapshots/targets/ipq40xx/generic/openwrt-ipq40xx-generic-linksys_ea6350v3-squashfs-factory.bin|factory.bin]]
  * [[https://downloads.openwrt.org/snapshots/targets/ipq40xx/generic/openwrt-ipq40xx-generic-linksys_ea6350v3-squashfs-sysupgrade.bin|sysupgrade.bin]]

==== sysupgrade ====

  * This downloads the latest ''sysupgrade.bin'' and installs it

  ssh 'root'@'192.168.1.1'

  rm -f '/tmp/sysupgrade.img' && sync && sysupgrade --force -n -v 'https://downloads.openwrt.org/snapshots/targets/ipq40xx/generic/openwrt-ipq40xx-generic-linksys_ea6350v3-squashfs-sysupgrade.bin'

  rm -Rf ~/'.ssh' && ping '192.168.1.1'

====== Packages ======

  * [[https://openwrt.org/docs/guide-user/luci/luci.essentials|LuCI]] ((snapshot images don't include LuCI, so it needs installed on **every** clean snapshot install))

  ssh 'root'@'192.168.1.1'

  sync && passwd

  opkg update && opkg install luci irqbalance nano && sync

====== Wireless AP Mode ======

  * https://openwrt.org/docs/guide-user/network/wifi/relay_configuration

===== Network =====

  * Sets router IP to ''192.168.2.1''
  * Sets router Gateway and DNS to ''192.168.1.1''
  * Disables DHCPv6

<code>uci set network.lan.ipaddr=192.168.2.1 & uci set network.lan.gateway=192.168.1.1 & uci set network.lan.dns=192.168.1.1 & uci set dhcp.lan.dhcpv6=disabled & uci set dhcp.lan.ra=disabled & uci commit & service network restart & sync</code>

===== Services =====

  * Disables ''dnsmasq'', ''firewall'', and ''odhcpd'' services

<code>/etc/init.d/dnsmasq disable & /etc/init.d/dnsmasq stop & /etc/init.d/firewall disable & /etc/init.d/firewall stop & /etc/init.d/odhcpd disable & /etc/init.d/odhcpd stop & /etc/init.d/network reload & sync</code>

====== irqbalance ======

  * https://openwrt.org/docs/guide-user/services/irqbalance

  nano '/etc/config/irqbalance'

====== LuCI ======

  * http://192.168.2.1

===== Startup =====

  * https://forum.openwrt.org/t/ipq40xx-ea6350-v3-as-wap-wifi-to-lan-latency/51623/8
  * :!: This is seemingly required in order to keep latency at a consistent 0.2ms on Ethernet

  * http://192.168.2.1/cgi-bin/luci/admin/system/startup

<code>
echo 'performance' | tee '/sys/devices/system/cpu/cpufreq/policy0/scaling_governor' > '/dev/null'</code>

==== Verify ====

<code>echo 'performance' | tee '/sys/devices/system/cpu/cpufreq/policy0/scaling_governor' > '/dev/null'</code>

<code>cat '/sys/devices/system/cpu/cpufreq/policy0/scaling_governor'</code>

<code>cat '/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq'</code>

===== Scheduled Reboot =====

  * https://www.albertogonzalez.net/how-to-reboot-nightly-your-openwrt-router/
  * https://openwrt.org/docs/guide-user/base-system/cron#periodic_reboot

  * http://192.168.1.2/cgi-bin/luci/admin/system/crontab

<code>
# Restart 3:32 AM
32 3 * * * sleep 70 && touch /etc/banner && reboot</code>

===== 1.1.1.1 DNS =====

  * https://1.1.1.1/dns/
  * See [[servers;upstream_dns_servers|DNS servers]] for other DNS servers

<code>2606:4700:4700::1111</code>

<code>2606:4700:4700::1001</code>

<code>1.1.1.1</code>

<code>1.0.0.1</code>

===== Wireless =====

==== 2.4GHz ====

  * Country Code: US
  * Channel: 6
  * Width: 20 MHz
  * Encryption: WPA2-PSK CCMP AES

<code>The Cathedral Rooftop (2.4GHz)</code>

==== 5GHz ====

  * Country Code: US
  * :!: Channel: 149
  * Width: 80 MHz
  * Encryption: WPA2-PSK CCMP AES

<code>The Beacon (5GHz)</code>

===== Firewall =====

  * 80/tcp HTTP
  * 443/tcp HTTPS

====== Recovery ======

===== mtd =====

  * https://openwrt.org/toh/linksys/ea8300#revert_to_stock
  * OpenWRT -> Linksys

==== Download Stock Firmware ====

  * https://www.linksys.com/support-article?articleNum=148481
  * ''3.1.10.191322'' from 2018 is the latest as of 2022/12/09

  ssh 'root'@'192.168.1.1'

  wget 'https://downloads.linksys.com/downloads/firmware/FW_EA6350v3_3.1.10.191322_prod.img'

==== Check Current Firmware Partition ====

  * 11 = ''kernel''
  * 13 = ''alt_kernel''
  * :!: Flash operations should be done on the kernel **not** mentioned in the following command ((so if ''13'' for ''alt_kernel'' is reported, ''mtd'' commands should be applied to ''kernel''))

  cat '/sys/devices/virtual/ubi/ubi0/mtd_num'

==== Erase Non-current Firmware Partition ====

  mtd erase 'kernel'

  mtd erase 'alt_kernel'

==== Flash Stock Firmware ====

  mtd write 'FW_EA6350v3_3.1.10.191322_prod.img' 'kernel'

  mtd write 'FW_EA6350v3_3.1.10.191322_prod.img' 'alt_kernel'

==== Boot Stock Firmware ====

  * 1 = ''kernel''
  * 2 = ''alt_kernel''

  fw_setenv 'boot_part' '1'

  fw_setenv 'boot_part' '2'

  sync && reboot