[riot-devel] Border router + ethos delay

Loïc Dauphin astralien3000 at yahoo.fr
Mon Dec 12 10:11:01 CET 2016


Hello !

I encounter some (huge) delay when using a border router and ethos.
Here is my configuration :

SAMR21-robot <-(802.15.4)-> SAMR21-border-router <-(ethos)-> 
MacOS(Linux_VirtualBox)


If I ping the SAMR21-robot from the SAMR21-border-router :

 > ping6 2001:db8::5841:1201:e760:2a2e
ping6 2001:db8::5841:1201:e760:2a2e
12 bytes from 2001:db8::5841:1201:e760:2a2e: id=84 seq=1 hop limit=64 
time = 8.417 ms
12 bytes from 2001:db8::5841:1201:e760:2a2e: id=84 seq=2 hop limit=64 
time = 10.330 ms
12 bytes from 2001:db8::5841:1201:e760:2a2e: id=84 seq=3 hop limit=64 
time = 10.009 ms
--- 2001:db8::5841:1201:e760:2a2e ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2.0653132 s
rtt min/avg/max = 8.417/9.585/10.330 ms


If I ping the SAMR21-robot from the MacOS(Linux_VBOX) :

 > ping6 -c 3 2001:db8::5841:1201:e760:2a2e
PING 2001:db8::5841:1201:e760:2a2e(2001:db8::5841:1201:e760:2a2e) 56 
data bytes
64 bytes from 2001:db8::5841:1201:e760:2a2e: icmp_seq=1 ttl=63 time=196 ms
64 bytes from 2001:db8::5841:1201:e760:2a2e: icmp_seq=2 ttl=63 time=205 ms
64 bytes from 2001:db8::5841:1201:e760:2a2e: icmp_seq=3 ttl=63 time=185 ms

--- 2001:db8::5841:1201:e760:2a2e ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2004ms
rtt min/avg/max/mdev = 185.033/195.698/205.830/8.506 ms


If I ping the SAMR21-border-router from the MacOS(Linux_VBOX) :

ping6 -c 3 fe80::221:d3ff:fe60:5a8d%tap0
PING fe80::221:d3ff:fe60:5a8d%tap0(fe80::221:d3ff:fe60:5a8d%tap0) 56 
data bytes
64 bytes from fe80::221:d3ff:fe60:5a8d%tap0: icmp_seq=1 ttl=64 time=171 ms
64 bytes from fe80::221:d3ff:fe60:5a8d%tap0: icmp_seq=2 ttl=64 time=162 ms
64 bytes from fe80::221:d3ff:fe60:5a8d%tap0: icmp_seq=3 ttl=64 time=169 ms

--- fe80::221:d3ff:fe60:5a8d%tap0 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 162.033/167.903/171.822/4.254 ms


If I ping the MacOS(Linux_VBOX) from the SAMR21-border-router :

 > ping6 fe80::478:c5ff:fe20:9b6c%7
ping6 fe80::478:c5ff:fe20:9b6c%7
12 bytes from fe80::478:c5ff:fe20:9b6c: id=85 seq=1 hop limit=64 time = 
87.869 ms
12 bytes from fe80::478:c5ff:fe20:9b6c: id=85 seq=2 hop limit=64 time = 
90.474 ms
12 bytes from fe80::478:c5ff:fe20:9b6c: id=85 seq=3 hop limit=64 time = 
92.986 ms
--- fe80::478:c5ff:fe20:9b6c ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2.06294564 s
rtt min/avg/max = 87.869/90.443/92.986 ms

One way seems to be faster than the second !

We can see that there is a problem between the Linux and the border-router.
But the 802.15.4 link seems ok !

Have someone an idea of why there is so much delay ?

Cheers !
Loïc


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