Hello Guys,
I’m From germany and since I got my new vDSL connection I have a bandwidth, probably MTU or tcp problem with my IPv6 Tunnel.
My Setup:
VDSL Modem Speedport 300HS → MikroTik Routerboard 450G
The MikroTik does the pppoe dial and my MTU setup looks as follows:
Interface ether1(uplink to vdsl modem): 1500 (L2MTU 1522)
Interface VDSL(just a vlan interface, my provider expects pppoe packet in vlan 7): 1500 (L2MTU 1516)
Interface ppp: max mtu: 1492; max mru 1492
Before I changed to VDSL I got a adsl2+ connection and nearly the same setup(without vlan interface) but no problem with my IPv6 he.net tunnel.
Since I changed to VDSL the downstream bandwidth decreased to 10 KiB/s, but it has to be at about 5 MiB/s.
sniffing on the wan interface shows that there are a lot of tcp duplicate acknowlegements, retransmissions and windows updates. pcap file is attached, just rename to .pcap.
Anyone here with similar problems or hints to get this problem solved?
Please help me,
Greetz,
Kokel
MikroTik export code:
/interface ethernet
set 0 arp=enabled auto-negotiation=yes bandwidth=unlimited/unlimited comment=
“Uplink to DSL Modem” disabled=no full-duplex=yes l2mtu=1520 mac-address=
00:0C:42:AF:49:B1 master-port=none mtu=1500 name=ether1 speed=100Mbps
/interface vlan
add arp=enabled comment=“vid 7 for Telekom VDSL2” disabled=no interface=ether1 l2mtu=1516
mtu=1500 name=VDSL2 use-service-tag=no vlan-id=7
/interface pppoe-client
add ac-name=“” add-default-route=yes allow=pap,chap comment=“T-Online PPP Dial”
dial-on-demand=no disabled=no interface=VDSL2 max-mru=1492 max-mtu=1492 mrru=disabled
name=T-Online password=xxxxxx profile=default service-name=“” use-peer-dns=no user=
xxxxxxxxxxxxxx@t-online.de
/interface 6to4
add comment=“he.net 6in4 Tunnel” disabled=no local-address=xxx.xxx.xxx.xxx mtu=1280 name=sit1
remote-address=216.66.80.30
/ipv6 address
add address=2001:470:1f0a:17c0::2/64 advertise=no comment=“Tunnelinterface he.net”
disabled=no eui-64=no interface=sit1
download_via_IPv6_Ubuntu1104.txt (65.1 KB)