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Topics - Walter H.

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1
IPv6 on Linux & BSD & Mac / Local end of HE Tunnel?
« on: March 16, 2017, 06:18:15 AM »
here is shown a short how to do
https://www.dragonsreach.it/2012/12/21/ipv6-tunneling-hurricane-electrics/

at 5. with Fedora there is shown this:
Code: [Select]
IPV6TUNNELIPV4="216.66.80.30"
IPV6TUNNELIPV4LOCAL="192.168.X.X" (Your PC's LAN IP address)

my router box (CentOS - as Fedora a RHEL based Linux) has two interfaces
- eth0 (LAN)
- eth1 (WAN)

because my ISP installed a router box, my router box has RFC1918 IPv4 addresses on both interfaces
e.g. 192.168.0.2 on eth1 (WAN)
and 172.16.0.1 on eth0 (LAN)

which of these 2 IP addresses should I configure as the local tunnel end?
(it works with both)

2
IPv6 on Linux & BSD & Mac / Linux based router (Mini-PC)
« on: September 14, 2016, 05:14:46 AM »
Hello,

the situation: the Mini-PC (2 RJ45-interfaces and a WLAN antenna) is between the IPv4only NAT-router from my ISP and my own LAN;
eth0 and wlan0 is connected to a bridge (br0) and is the LAN "interface"
eth1 is the WAN interface
sit1 is the IPv6 tunnel end at my side (IPv6 address: 2001:470:1f0a:9c4::2/64)

the br0 has the following two addresses
2001:470:747b::1/48 (one IPv6 address from the routed /48)
2001:470:1f0b:9c8::1/64 (one IPv6 address from the routed /64)

my home LAN is for me and my roommate;
the time before I've been using this Mini-PC I used IPv6 only myself;

on my virtual machines (mostly Linux) I use fixed IPv6 addresses from the routed /64,
so there is as gateway the one IPv6 address from the routed /64 from above;
this works: the virtual machines to each other and also internet;

but: my roommate uses on his windows IPv6 addresses from the routed /48 like this:
IPV6 address: 2001:470:747b:13::10
Subnet prefix length: 48
Default gateway: 2001:470:747b::1

Preferred DNS server: 2001:470:747b::1

one of the virtual machines (mentioned above) has the
inet6 addr 2001:470:1f0b:9c8::17/64 with default gateway 2001:470:1f0b:9c8::1

and now the question that sounds really strange:

why can the mate's computer (has /48 routed IPv6 address) ping the virtual machine (has /64 routed IPv6 address)
but not the other way round?
except the only Linux is the mini-pc itself that can ping computers with /48 routed IPv6 addresses ...
(this is not specific to this two, every computer/virtual machine that has a /48 routed IPv6 address
can ping another one with /64 routed IPv6 address and not the other way round)

is there missing a routing between these to prefixes on my mini pc router?

I did run tcpdump -n icmpv6 on the mini-pc router while I ran ping6 on the virtual machine with a /64 routed IPv6 address

Code: [Select]
14:04:19.827501 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 7, length 64
14:04:19.827544 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:19.827552 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 7, length 64
14:04:20.827554 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 8, length 64
14:04:20.827664 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:20.827698 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 8, length 64
14:04:21.826572 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 9, length 64
14:04:21.826669 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:21.826701 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 9, length 64
14:04:22.825612 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 10, length 64
14:04:22.825717 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:22.825748 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 10, length 64
14:04:23.823205 IP6 fe80::264c:4eff:fe58:3124 > fe80::2646:57ff:fe30:3124: ICMP6, neighbor solicitation, who has fe80::2646:57ff:fe30:3124, length 32
14:04:23.823309 IP6 fe80::2646:57ff:fe30:3124 > fe80::264c:4eff:fe58:3124: ICMP6, neighbor advertisement, tgt is fe80::2646:57ff:fe30:3124, length 24
14:04:23.823620 IP6 fe80::2646:57ff:fe30:3124 > fe80::264c:4eff:fe58:3124: ICMP6, neighbor solicitation, who has fe80::264c:4eff:fe58:3124, length 32
14:04:23.823840 IP6 fe80::264c:4eff:fe58:3124 > fe80::2646:57ff:fe30:3124: ICMP6, neighbor advertisement, tgt is fe80::264c:4eff:fe58:3124, length 24
14:04:23.825545 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 11, length 64
14:04:23.825638 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:23.825673 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 11, length 64
14:04:24.824686 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 12, length 64
14:04:24.824790 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:24.824823 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 12, length 64
14:04:25.824695 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 13, length 64
14:04:25.824803 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:25.824835 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 13, length 64
14:04:26.824728 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 14, length 64
14:04:26.824831 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:26.824861 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 14, length 64
14:04:26.891918 IP6 fe80::2646:57ff:fe30:3124 > ff02::1: ICMP6, router advertisement, length 24
14:04:27.825023 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 15, length 64
14:04:27.825130 IP6 fe80::2646:57ff:fe30:3124 > 2001:470:1f0b:9c8::17: ICMP6, redirect, 2001:470:747b:13::10 to 2001:470:747b:13::10, length 160
14:04:27.825162 IP6 2001:470:1f0b:9c8::17 > 2001:470:747b:13::10: ICMP6, echo request, seq 15, length 64

please can someone give me a hint where the problem resides ...

Thanks,
Walter

Pages: [1]