Package: dnsmasq
Version: 2.76-5+deb9u1
Severity: normal
Tags: ipv6
Dear Maintainer,
* What led up to the situation?
My browsing from my Windows box suddenly went weird
* What exactly did you do (or not do) that was effective (or
ineffective)?
I checked the MTU sizes the Windows box was using: 1500 for both ipv4
and ipv6. The ipv6 one should be 1280 (I'm using an HE tunnel). So I
fixed it in windows using
netsh interface ipv6 set subinterface "Local Area Connection" mtu=1280
store=persistent
* What was the outcome of this action?
Minutes later it was back to 1500 so I looked at my dnsmasq.conf
(attached) - all seems tickety boo so I checked
/proc/sys/net/ipv6/conf/he-ipv6/mtu and that is correctly set to 1280,
so for some reason dnsmasq is not picking that up and advertising it for
my he-ipv6 interface. I checked with wireshark and the ra packets are
being sent out with MTU 1500 not 1280.
* What outcome did you expect instead?
I expected Windows to receive the correct MTU size of 1280 as set in
/proc/sys/net/ipv6/conf/he-ipv6/mtu
Many thanks for a great piece of software,
CC
-- System Information:
Debian Release: 9.5
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.9.0-8-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages dnsmasq depends on:
ii dnsmasq-base 2.76-5+deb9u1
ii init-system-helpers 1.48
ii netbase 5.4
dnsmasq recommends no packages.
Versions of packages dnsmasq suggests:
pn resolvconf <none>
-- Configuration Files:
/etc/dnsmasq.conf changed:
domain-needed
bogus-priv
no-resolv
no-poll
server=2606:4700:4700::1111
server=2606:4700:4700::1001
server=1.1.1.1
server=1.0.0.1
local=/sadnet/
interface=int0
bind-interfaces
expand-hosts
domain=sadnet
dhcp-range=192.168.4.1,192.168.4.127,255.255.255.0,192.168.4.255,24h
read-ethers
dhcp-option=42,0.0.0.0
dhcp-option=19,0 # option ip-forwarding off
dhcp-option=44,0.0.0.0 # set netbios-over-TCP/IP nameserver(s) aka
WINS server(s)
dhcp-option=45,0.0.0.0 # netbios datagram distribution server
dhcp-option=46,8 # netbios node type
dhcp-option=47 # empty netbios scope.
dhcp-option=vendor:PXEClient,1,192.168.4.30
dhcp-option=vendor:MSFT,2,1i
dhcp-option=vendor:Etherboot,60,"Etherboot"
dhcp-boot=pxelinux.0
enable-tftp
tftp-root=/srv/Linux/images/Debian-netboot
dhcp-authoritative
bogus-nxdomain=64.94.110.11
bogus-nxdomain=81.200.64.50
mx-target=mail.sadnet
localmx
log-dhcp
bootp-dynamic
cname=ntinstall,fatboy
cname=uranos,fatboy
enable-ra
dhcp-range=tag:int0,::1,constructor:int0,ra-names,24h
dhcp-option=option6:dns-server,2001:470:1f1d:1d3::1
-- no debconf information
