Slow Speed

[mailmantinc at mobfunk.de]

Hi,

I´m using Tinc for several years, but I didn´t fix a performance problem.

There a about 20 nodes in this network.

Master:

10.0.0.12 (dedicated host in a datacenter, debian, 100mBit port)

tinc.conf:

Name = TincKnoten12
AddressFamily = ipv4
Interface = tun
ProcessPriority=high
mode = router
#DirectOnly = no
Compression=0
PMTUDiscovery = yes
#IndirectData = yes
#ReplayWindow = 64
#ConnectTo = TincKnoten1
GraphDumpFile = /tmp/tinc-graph
LocalDiscovery = yes
ClampMSS = yes
PMTU = 1400
#DirectOnly=yes
#IndirectData=yes
Cipher=AES-128-CBC
#TCPOnly=yes


mac:10.0.0.20 (1gig directly to our backbone via mpls from out office-vlan)

Name=TincKnoten20
AddressFamily = ipv4
Device = /dev/tap0
ConnectTo = TincKnoten12
ProcessPriority=high
mode = router
#DirectOnly = no
Compression=0
Cipher=AES-128-CBC
IndirectData = yes
#ReplayWindow = 64
ClampMSS = yes
PMTU = 1400
PMTUDiscovery = yes

frechly installed debian 10.0.0.27 (50/10MBit DSL Access):

Name=TincKnoten27
AddressFamily=ipv4
Device=/dev/net/tun
ConnectTo = TincKnoten12
LocalDiscovery = yes
AddressFamily = ipv4
Compression=0
ClampMSS = yes
Cipher=AES-128-CBC
ProcessPriority=high
mode = router
PMTUDiscovery = yes


Test with scp:

10.0.0.20->10.0.0.12 7.8MegaByte/s (good enough)

10.0.0.20->10.0.0.27 700kByte (slow)

10.0.0.12-> 10.0.0.20 26MegaByte

10.0.0.12 -> 10.0.0.27 700kByte (slow, should be 10mBit)

10.0.0.27 -> 10.0.0.20 700kByte (slow)

10.0.0.27 -> 10.0.0.12 1MegaByte/s (Linespeed 10mBit->fine)


There a much more nodes (with the same master 10.0.0.12) and the same 
speed-problemes on different sites (with 1-2 old openwrt-routers with 
very old tinc-versions).

I think the problem is mtu related.

How can I improve the speed? The cpu-speed on the computers should by 
high enough.


Best regards,

Marc


graph on 10.0.0.12:

root at www:~# cat /tmp/tinc-graph
digraph {
         TincKnoten10 [label = "TincKnoten10"];
         TincKnoten12 [label = "TincKnoten12"];
         TincKnoten14 [label = "TincKnoten14"];
         TincKnoten20 [label = "TincKnoten20"];
         TincKnoten24 [label = "TincKnoten24"];
         TincKnoten27 [label = "TincKnoten27"];
         TincKnoten28 [label = "TincKnoten28"];
         TincKnoten30 [label = "TincKnoten30"];
         TincKnoten35 [label = "TincKnoten35"];
         TincKnoten37 [label = "TincKnoten37"];
         TincKnoten38 [label = "TincKnoten38"];
         TincKnoten39 [label = "TincKnoten39"];
         TincKnoten40 [label = "TincKnoten40"];
         TincKnoten41 [label = "TincKnoten41"];
         TincKnoten42 [label = "TincKnoten42"];
         TincKnoten8 [label = "TincKnoten8"];
         TincKnoten12 -> TincKnoten27;
         TincKnoten27 -> TincKnoten12;
         TincKnoten12 -> TincKnoten35;
         TincKnoten35 -> TincKnoten12;
         TincKnoten12 -> TincKnoten20;
         TincKnoten20 -> TincKnoten12;
         TincKnoten12 -> TincKnoten8;
         TincKnoten8 -> TincKnoten12;
         TincKnoten12 -> TincKnoten42;
         TincKnoten42 -> TincKnoten12;
         TincKnoten12 -> TincKnoten24;
         TincKnoten24 -> TincKnoten12;
         TincKnoten12 -> TincKnoten41;
         TincKnoten41 -> TincKnoten12;
         TincKnoten12 -> TincKnoten38;
         TincKnoten38 -> TincKnoten12;
         TincKnoten12 -> TincKnoten37;
         TincKnoten37 -> TincKnoten12;
         TincKnoten12 -> TincKnoten40;
         TincKnoten40 -> TincKnoten12;
         TincKnoten12 -> TincKnoten39;
         TincKnoten39 -> TincKnoten12;
         TincKnoten12 -> TincKnoten30;
         TincKnoten30 -> TincKnoten12;
         TincKnoten10 -> TincKnoten12;
         TincKnoten12 -> TincKnoten10;
         TincKnoten12 -> TincKnoten14;
         TincKnoten14 -> TincKnoten12;
}
root at www:~#