IPv6 Addresses

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Author
geffers
Posts: 80
Joined: Sat Feb 12, 2022 2:01 am

IPv6 Addresses

#1 Post by geffers »

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System:    Kernel: 5.10.0-32-amd64 [5.10.223-1] x86_64 bits: 64 compiler: gcc v: 10.2.1 
           parameters: BOOT_IMAGE=/boot/vmlinuz-5.10.0-32-amd64 root=UUID=<filter> ro splash quiet 
           init=/lib/systemd/systemd 
           Desktop: KDE Plasma 5.20.5 wm: kwin_x11 vt: 7 dm: SDDM 
           Distro: MX-21.3_KDE_x64 Wildflower September 18  2022 
           base: Debian GNU/Linux 11 (bullseye) 
Machine:   Type: Laptop System: TOSHIBA product: SATELLITE C55D-C v: PSCQEE-03C00TEN 
           serial: <filter> 
           Mobo: FF50 model: 06F7 serial: <filter> UEFI: Insyde v: 5.20 date: 10/02/2015 
Battery:   ID-1: BAT1 charge: 12.3 Wh (48.6%) condition: 25.3/31.7 Wh (79.7%) volts: 15.9 
           min: 14.4 model: Panasonic PA5185U-1BRS type: Li-ion serial: N/A status: Charging 
           cycles: 262 
CPU:       Info: Quad Core model: AMD A8-7410 APU with AMD Radeon R5 Graphics bits: 64 type: MCP 
           arch: Puma family: 16 (22) model-id: 30 (48) stepping: 1 microcode: 7030105 cache: 
           L2: 2 MiB 
           flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 17566 
           Speed: 1138 MHz min/max: 1000/2200 MHz boost: enabled Core speeds (MHz): 1: 1138 
           2: 1140 3: 1097 4: 1134 
           Vulnerabilities: Type: gather_data_sampling status: Not affected 
           Type: itlb_multihit status: Not affected 
           Type: l1tf status: Not affected 
           Type: mds status: Not affected 
           Type: meltdown status: Not affected 
           Type: mmio_stale_data status: Not affected 
           Type: reg_file_data_sampling status: Not affected 
           Type: retbleed mitigation: untrained return thunk; SMT disabled 
           Type: spec_rstack_overflow status: Not affected 
           Type: spec_store_bypass 
           mitigation: Speculative Store Bypass disabled via prctl and seccomp 
           Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization 
           Type: spectre_v2 
           mitigation: Retpolines, STIBP: disabled, RSB filling, PBRSB-eIBRS: Not affected 
           Type: srbds status: Not affected 
           Type: tsx_async_abort status: Not affected 
Graphics:  Device-1: AMD Mullins [Radeon R4/R5 Graphics] vendor: Toshiba driver: radeon v: kernel 
           alternate: amdgpu bus-ID: 00:01.0 chip-ID: 1002:9851 class-ID: 0300 
           Device-2: IMC Networks TOSHIBA Web Camera - HD type: USB driver: uvcvideo 
           bus-ID: 2-1.1:3 chip-ID: 13d3:5652 class-ID: 0e02 serial: <filter> 
           Display: x11 server: X.Org 1.20.14 compositor: kwin_x11 driver: loaded: ati,radeon 
           unloaded: fbdev,modesetting,vesa display-ID: :0 screens: 1 
           Screen-1: 0 s-res: 1366x768 s-dpi: 96 s-size: 361x203mm (14.2x8.0") 
           s-diag: 414mm (16.3") 
           Monitor-1: eDP res: 1366x768 hz: 60 dpi: 101 size: 344x194mm (13.5x7.6") 
           diag: 395mm (15.5") 
           OpenGL: renderer: AMD KABINI (LLVM 14.0.5 DRM 2.50 5.10.0-32-amd64) v: 4.5 Mesa 22.0.5 
           direct render: Yes 
Audio:     Device-1: AMD Kabini HDMI/DP Audio vendor: Toshiba driver: snd_hda_intel v: kernel 
           bus-ID: 00:01.1 chip-ID: 1002:9840 class-ID: 0403 
           Device-2: AMD FCH Azalia vendor: Toshiba driver: snd_hda_intel v: kernel 
           bus-ID: 00:14.2 chip-ID: 1022:780d class-ID: 0403 
           Sound Server-1: ALSA v: k5.10.0-32-amd64 running: yes 
           Sound Server-2: PulseAudio v: 14.2 running: yes 
Network:   Device-1: Realtek RTL810xE PCI Express Fast Ethernet vendor: Toshiba driver: r8169 
           v: kernel port: 3000 bus-ID: 01:00.0 chip-ID: 10ec:8136 class-ID: 0200 
           IF: eth0 state: down mac: <filter> 
           Device-2: Realtek RTL8821AE 802.11ac PCIe Wireless Network Adapter driver: rtl8821ae 
           v: kernel modules: wl port: 2000 bus-ID: 02:00.0 chip-ID: 10ec:8821 class-ID: 0280 
           IF: wlan0 state: up mac: <filter> 
Bluetooth: Device-1: Toshiba Bluetooth Radio type: USB driver: btusb v: 0.8 bus-ID: 2-1.2:4 
           chip-ID: 0930:022f class-ID: e001 serial: <filter> 
           Report: hciconfig ID: hci0 rfk-id: 2 state: up address: <filter> bt-v: 2.1 lmp-v: 4.0 
           sub-v: 8821 hci-v: 4.0 rev: a 
           Info: acl-mtu: 820:8 sco-mtu: 255:16 link-policy: rswitch hold sniff park 
           link-mode: slave accept service-classes: rendering, capturing, object transfer, audio 
Drives:    Local Storage: total: 465.76 GiB used: 41.26 GiB (8.9%) 
           SMART Message: Unable to run smartctl. Root privileges required. 
           ID-1: /dev/sda maj-min: 8:0 vendor: Crucial model: CT500MX500SSD1 size: 465.76 GiB 
           block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s type: SSD serial: <filter> 
           rev: 043 scheme: GPT 
Partition: ID-1: / raw-size: 48.83 GiB size: 47.76 GiB (97.81%) used: 41.13 GiB (86.1%) fs: ext4 
           dev: /dev/sda5 maj-min: 8:5 
           ID-2: /boot/efi raw-size: 260 MiB size: 256 MiB (98.46%) used: 127.1 MiB (49.7%) 
           fs: vfat dev: /dev/sda1 maj-min: 8:1 
Swap:      Alert: No swap data was found. 
Sensors:   System Temperatures: cpu: 51.5 C mobo: N/A gpu: radeon temp: 55.0 C 
           Fan Speeds (RPM): N/A 
Repos:     Packages: note: see --pkg apt: 2747 lib: 1514 flatpak: 0 
           No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/debian-stable-updates.list 
           1: deb http://deb.debian.org/debian bullseye-updates main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/debian.list 
           1: deb http://deb.debian.org/debian bullseye main contrib non-free
           2: deb http://security.debian.org/debian-security bullseye-security main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/mkusb.list 
           1: deb http://ppa.launchpad.net/mkusb/ppa/ubuntu bionic main
           Active apt repos in: /etc/apt/sources.list.d/mx.list 
           1: deb http://mxlinux.mirrors.uk2.net/packages/mx/repo/ bullseye main non-free
           2: deb http://mxlinux.mirrors.uk2.net/packages/mx/repo/ bullseye ahs
           Active apt repos in: /etc/apt/sources.list.d/signal-xenial.list 
           1: deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main
Info:      Processes: 231 Uptime: 32m wakeups: 1 Memory: 10.66 GiB used: 2.08 GiB (19.5%) 
           Init: systemd v: 247 runlevel: 5 default: 5 tool: systemctl Compilers: gcc: 10.2.1 
           alt: 10 Client: shell wrapper v: 5.1.4-release inxi: 3.3.06 
Boot Mode: UEFI
Folks,

Due to my new ISP using CGNAT the port redirection in the router does not function so I am looking at IPv6 addresses as my old TP-Link router actually supports it along with a firewall.

Now to my question, if I issue ifconfig on a Raspberry Pi in my network the results show three inet6 addresses. One starts fe80:: and bears no resemblance to the other two, which are similar but one is longer. Plus if I use a IPv4 to IPv6 converter I get a fourth address which is different to the other three. Apart from the address starting fe80:: all the others will allow an ssh connection.

Why would three different IPv6 addresses be valid yet only one IPv4 address work?

Geffers

User avatar
timkb4cq
Developer
Posts: 3624
Joined: Wed Jul 12, 2006 4:05 pm

Re: IPv6 Addresses

#2 Post by timkb4cq »

The FE80 addresses are "link-local", not routed outside the local LAN.
To find your external ipv6 address, the easiest way is to open a browser here:
https://whatismyipaddress.com/
HP Pavillion TP01, AMD Ryzen 3 5300G (quad core), Crucial 500GB SSD, Toshiba 6TB 7200rpm
Dell Inspiron 15, AMD Ryzen 7 2700u (quad core). Sabrent 500GB nvme, Seagate 1TB

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