Am Dienstag, 16. April 2019, 12:53:12 CEST schrieb Carlos E. R.:
On 4/16/19 7:29 AM, Per Jessen wrote:
Carlos E. R. wrote:
Who is "ff02::1"? This machine or the router?
It's a multicast address.
https://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast -addresses.xhtml https://en.wikipedia.org/wiki/Multicast_address
Ah, ok.
I'm curious because my router doesn't hand out IPv6 addresses, yet that is coming from the router.
The router obviously understands IPv6, but maybe it doesn't have any prefix. As James already suggested, run wireshark or tcpdump to see what else it's up to.
tcpdump -n -i dev ip6
linux-0o2k:~ # tcpdump -n -i dev ip6 tcpdump: dev: No such device exists (SIOCGIFHWADDR: No such device) linux-0o2k:~ #
I suppose it is -i eth0 but then I get everything.
Ah! "tcpdump -n -i eth0 ip6"
Nothing much: linux-0o2k:~ # tcpdump -n -i eth0 ip6 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes 12:46:05.141051 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 12:46:09.157109 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 12:46:17.180165 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 12:46:23.945444 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 12:46:31.368144 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 12:46:34.804115 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 12:46:43.232276 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 12:46:48.711316 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 ... 12:48:45.654171 IP6 fe80::fa8e:85ff:fe64:78f2 > ff02::1: ICMP6, router advertisement, length 32 ^C 27 packets captured 27 packets received by filter 0 packets dropped by kernel linux-0o2k:~ #
I would expect to see neighbour solicitations/advertisements, maybe mDNS broadcasts.
No, just those broadcasts. There doesn't seem to be replies :-?
Wireshark is not installed, and the whole system is 15 GB. I'm testing Leap 15.1 on a 15GB partition that includes home. tcpdump is better in this case, although I'm not familiar with it.
The router is IPv6 capable, but the ISP is apparently not providing IPv6 addresses or connectivity. Thus seeing those v6 broadcasts aroused my curiosity.
just run radvdump and you'll see that (most likely) your router +is+ in fact handing out IPv6 adresses. Cheers MH -- Mathias Homann Senior Systems Engineer, IT Consultant. IT Trainer Mathias.Homann@openSUSE.org http://www.tuxonline.tech gpg key fingerprint: 8029 2240 F4DD 7776 E7D2 C042 6B8E 029E 13F2 C102