Sys Admin Pocket Survival Guide

IPv6 101

address

Any address starting with "::", "fc", "fd", or "fe" are unable to work with the public IPv6 Internet.

fe80::                                  # ipv6 link local, autogenerated (like IPv5 169.254...) can't go thru router, but usable in same subnet

fe80::ec4:7aff:fe75:c9b0                # bofh    ipv6 link local 
          0cc4:7a75:c9b0                # bofh    mac
fe80::221:ccff:fed3:3d41                # cueball ipv6 link local
          0021:ccd3:3d41                # cueball mac 

ping6 fe80::ec4:7aff:fe75:c9b0%2        # works (same host or another host on same subnet).  %2 is interface id as per "ip a"

https://askubuntu.com/questions/546405/ping-adress-ipv6


####
#### test cmd 2021.06
####

# ping6
# ssh -6


# https://serverfault.com/questions/1007184/how-to-check-ipv6-address-via-command-line
# ip -6 addr show scope global
# curl -6 https://ifconfig.co                    # return what web server see of my ip.  didnt work for bofh or casa

# telnet -6 lunaria.dyn.berkeley.edu
# telnet -6 2607:f140:1:0:18af:466c:c1e:c947 22  #  lunaria # try this for 2021.0608
# ssh       2607:f140:1:0:18af:466c:c1e:c947     #  works w/in lunaria

# dig -6 TXT +short o-o.myaddr.l.google.com @ns1.google.com
# dig -t aaaa +short myip.opendns.com @resolver1.opendns.com


2607:f140:1:0:357a:70dd:6b82:65ff       domingo # 2021.0603
2607:f140:1:0:18af:466c:0c1e:c947       lunaria # 2021.0608
                   0019:b919:0ffa       lunaria mac
2607:f140:e000:1:9a03:9bff:fea2:b5f4    dtn.brc.berkeley.edu # 2021.0608

2601:0641:0400:0261:0208f:9599:d1f4:233a      comcast  z
                          0011:a300:c50b


lunaria, test-ipv6.com says no ipv6 access, (below is old info from 2020):

                             0019:b919:0ffa mac
    inet6 2607:f140:1:4:149e:a69a:62d0:c507/64 scope global temporary deprecated dynamic 
    inet6 2607:f140:1:4:58da:a619:68b3:a4aa/64 scope global temporary deprecated dynamic 
    inet6 2607:f140:1:4:398c:b98:86b2:c6d8/64  scope global temporary deprecated dynamic 
    inet6 2607:f140:1:4:bd82:93c7:ad69:691b/64 scope global temporary deprecated dynamic 
    inet6 2607:f140:1:4:f553:7c99:1da9:bda/64  scope global temporary deprecated dynamic 
    inet6 2607:f140:1:4:b1cb:55cd:3c8a:dd5f/64 scope global temporary deprecated dynamic 
    inet6 2607:f140:1:4:34:aee6:552b:3b9e/64   scope global temporary deprecated dynamic 
    inet6 2607:f140:1:4:8e98:2463:5141:d862/64 scope global deprecated mngtmpaddr noprefixroute dynamic 
    inet6 fe80::e668:bc67:eb2f:cc49/64         scope link

...

...

Commands/Troubleshooting

Reference

tba

Performance

..

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