QoS Tools
The following tools are currently available/operational:
- QoS Traceroute can be used to debug marking problems.
- Taksometro shows the bitrate for the different classes of services.
- The Premium IP Reservation Tool automates the approval of requests for the Premium IP Service.
In addition, further monitoring tools will be deployed in the framework of the PerfMonit activity.
QoS Traceroute
Checking whether the ToS is rewritten to another value can be done from GÉANT. The output of the traceroute can be interpreted as follows.
A traceroute is run from PSCN to ACONET with the ToS value of 184 (Premium IP).
[root]# ./traceroute -t 184 x.x.x.x
traceroute to x.x.x.x (x.x.x.x), 30 hops max, 40 byte packets
1 css7-ATM4-0-0-101-dmsk.man.poznan.pl (150.254.160.62) 1 ms 1 ms 1ms
2 150.254.163.118 (150.254.163.118) 2 ms 2 ms 2 ms
3 z-pozmanu-oc3.poznan-gw.pol34.pl (212.191.127.49) 2 ms 2 ms 2 ms
4 pol-34.pl1.pl.GEANT.net (62.40.103.109) 2 ms 2 ms 2 ms
5 pl.cz1.cz.GEANT.net (62.40.96.45) 22 ms (TOS=0!) 22 ms 22 ms
6 cz.de1.de.GEANT.net (62.40.96.38) 30 ms 30 ms 30 ms
7 de1-1.de2.de.GEANT.net (62.40.96.130) 30 ms 30 ms 31 ms
8 de.at1.at.GEANT.net (62.40.96.5) 43 ms 43 ms 43 ms
9 aconet-gw.at1.at.GEANT.net (62.40.103.2) 43 ms 43 ms 43 ms
10 x.x.x.x (x.x.x.x) 45 ms * 45 ms
As shown above, the router cz1.cz.GEANT.net "detects" that the tagging has been changed to ToS = 0 (line 5), and thus the traffic is considered as Best Effort. This means that the ToS value has been changed either on the router itself or on the previous router (depending on where the ToS is changed and where the router generates the ICMP reply). Because those two routers are Juniper routers (where re-marking is done at the output interface) the problem is on pl1.pl.GEANT.net.
