Your message dated Tue, 10 Oct 2017 18:43:24 +0200 with message-id <56f1c4cc-7b2c-d720-4d96-27a3604e5...@debian.org> and subject line Re: ignores Route Preference in received router advertisements has caused the Debian Bug report #844246, regarding ignores Route Preference in received router advertisements to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact ow...@bugs.debian.org immediately.) -- 844246: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=844246 Debian Bug Tracking System Contact ow...@bugs.debian.org with problems
--- Begin Message ---Package: systemd Version: 232-3 Severity: important Hi, the systemd IPv6 code ignores the Route Preference that is in an incoming router advertisement. Here is what tshark -V says about the packet: Frame 53: 294 bytes on wire (2352 bits), 294 bytes captured (2352 bits) on interface 0 Interface id: 0 (wlp3s0) Encapsulation type: Ethernet (1) Arrival Time: Nov 13, 2016 19:14:05.830790406 CET [Time shift for this packet: 0.000000000 seconds] Epoch Time: 1479060845.830790406 seconds [Time delta from previous captured frame: 0.044608796 seconds] [Time delta from previous displayed frame: 0.044608796 seconds] [Time since reference or first frame: 3.084251040 seconds] Frame Number: 53 Frame Length: 294 bytes (2352 bits) Capture Length: 294 bytes (2352 bits) [Frame is marked: False] [Frame is ignored: False] [Protocols in frame: eth:ethertype:ipv6:icmpv6] Ethernet II, Src: 7e:79:61:31:55:28 (7e:79:61:31:55:28), Dst: IPv6mcast_01 (33:33:00:00:00:01) Destination: IPv6mcast_01 (33:33:00:00:00:01) Address: IPv6mcast_01 (33:33:00:00:00:01) .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default) .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast) Source: 7e:79:61:31:55:28 (7e:79:61:31:55:28) Address: 7e:79:61:31:55:28 (7e:79:61:31:55:28) .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) Type: IPv6 (0x86dd) Internet Protocol Version 6, Src: fe80::1, Dst: ff02::1 0110 .... = Version: 6 .... 0000 0000 .... .... .... .... .... = Traffic class: 0x00 (DSCP: CS0, ECN: Not-ECT) .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0) .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0) .... .... .... 1000 1110 0101 0001 0001 = Flow label: 0x8e511 Payload length: 240 Next header: ICMPv6 (58) Hop limit: 255 Source: fe80::1 Destination: ff02::1 [Source GeoIP: Unknown] [Destination GeoIP: Unknown] Internet Control Message Protocol v6 Type: Router Advertisement (134) Code: 0 Checksum: 0x67f3 [correct] [Checksum Status: Good] Cur hop limit: 64 Flags: 0x00 0... .... = Managed address configuration: Not set .0.. .... = Other configuration: Not set ..0. .... = Home Agent: Not set ...0 0... = Prf (Default Router Preference): Medium (0) .... .0.. = Proxy: Not set .... ..0. = Reserved: 0 Router lifetime (s): 1800 Reachable time (ms): 0 Retrans timer (ms): 0 ICMPv6 Option (Prefix information : 2a01:238:4071:3282::/64) Type: Prefix information (3) Length: 4 (32 bytes) Prefix Length: 64 Flag: 0xc0 1... .... = On-link flag(L): Set .1.. .... = Autonomous address-configuration flag(A): Set ..0. .... = Router address flag(R): Not set ...0 0000 = Reserved: 0 Valid Lifetime: 86400 Preferred Lifetime: 14400 Reserved Prefix: 2a01:238:4071:3282:: ICMPv6 Option (Route Information : High ::/0) Type: Route Information (24) Length: 3 (24 bytes) Prefix Length: 0 Flag: 0x08 ...0 1... = Route Preference: High (1) 000. .000 = Reserved: 0 Route Lifetime: 1800 Prefix: :: ICMPv6 Option (Route Information : Low 2000::/3) Type: Route Information (24) Length: 3 (24 bytes) Prefix Length: 3 Flag: 0x18 ...1 1... = Route Preference: Low (3) 000. .000 = Reserved: 0 Route Lifetime: 1800 Prefix: 2000:: ICMPv6 Option (Route Information : High 2a01:238:4071:3280::/59) Type: Route Information (24) Length: 3 (24 bytes) Prefix Length: 59 Flag: 0x08 ...0 1... = Route Preference: High (1) 000. .000 = Reserved: 0 Route Lifetime: 1800 Prefix: 2a01:238:4071:3280:: ICMPv6 Option (Route Information : High 2a01:238:4071:32b0::/60) Type: Route Information (24) Length: 3 (24 bytes) Prefix Length: 60 Flag: 0x08 ...0 1... = Route Preference: High (1) 000. .000 = Reserved: 0 Route Lifetime: 1800 Prefix: 2a01:238:4071:32b0:: ICMPv6 Option (Recursive DNS Server 2a01:238:4071:3281::35:100 2a01:238:4071:328e::35:100) Type: Recursive DNS Server (25) Length: 5 (40 bytes) Reserved Lifetime: 600 Recursive DNS Servers: 2a01:238:4071:3281::35:100 Recursive DNS Servers: 2a01:238:4071:328e::35:100 ICMPv6 Option (DNS Search List Option zugschlus.de ka51.zugschlus.de) Type: DNS Search List Option (31) Length: 6 (48 bytes) Reserved Lifetime: 600 Domain Names: zugschlus.de Domain Names: ka51.zugschlus.de Padding ICMPv6 Option (Source link-layer address : 7e:79:61:31:55:28) Type: Source link-layer address (1) Length: 1 (8 bytes) Link-layer address: 7e:79:61:31:55:28 (7e:79:61:31:55:28) Please note the line ICMPv6 Option (Route Information : Low 2000::/3) which explictly tells the client to coinfigure the router for 2000::/3 with a low preference so that it doesn't accidentally overwrite the same route that might be pointing into a VPN tunnel. In fact, the route is established with "medium" preference: | 2000::/3 via fe80::1 dev wlp3s0 proto ra metric 600 pref medium | 2000::/3 dev tun0 metric 1024 pref medium which of course severely cripples the client's connectivity. I think that systemd should either leave IPv6 negotiation to the kernel, or do it correctly. I am, however, not sure whether the IPv6 user space handling code is currently enabled or not. If the code is disabled, then I'd better report this issue agains the kernel. Please advise. Greetings Marc -- Package-specific info: -- System Information: Debian Release: stretch/sid APT prefers unstable APT policy: (500, 'unstable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.8.7-zgws1 (SMP w/4 CPU cores) Locale: LANG=en_DK.utf8, LC_CTYPE=en_DK.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages systemd depends on: ii adduser 3.115 ii libacl1 2.2.52-3 ii libapparmor1 2.10.95-6 ii libaudit1 1:2.6.7-1 ii libblkid1 2.29-1 ii libc6 2.24-5 ii libcap2 1:2.25-1 ii libcryptsetup4 2:1.7.3-2 ii libgcrypt20 1.7.3-2 ii libgpg-error0 1.24-2 ii libidn11 1.33-1 ii libip4tc0 1.6.0-4 ii libkmod2 23-1 ii liblzma5 5.2.2-1.2 ii libmount1 2.29-1 ii libpam0g 1.1.8-3.3 ii libseccomp2 2.3.1-2 ii libselinux1 2.6-3 ii libsystemd0 232-3 ii mount 2.29-1 ii util-linux 2.29-1 Versions of packages systemd recommends: ii dbus 1.10.12-1 ii libpam-systemd 232-3 Versions of packages systemd suggests: ii policykit-1 0.105-17 pn systemd-container <none> pn systemd-ui <none> Versions of packages systemd is related to: pn dracut <none> ii initramfs-tools 0.125 ii udev 232-3 -- no debconf information
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--- Begin Message ---On Sat, 3 Dec 2016 22:48:00 +0100 Marc Haber <mh+debian-b...@zugschlus.de> wrote: > Hi Andreas, > > I appreciate the work and detail you have put into this issue and > apologize for my flawed preparation of the bug report in advance. > > On Thu, Nov 17, 2016 at 04:26:30PM +0100, Andreas Henriksson wrote: > > When *not* using networkd (ie. kernel ndisc handling) the route gets set > > up with preference medium though. > > You're so right. I observed the issue on my personal notebook which is > the -only- system in my environment that does -not- run > systemd-networkd for its lack of WPA support. I therefore filed this > bug report against the wrong package. Feel free to close this. Thanks for the detailed analysis, Andreas. Closing the bug report according to Marc's feedback. Michael -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?signature.asc
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