TY - JOUR
T1 - Exploring DSCP modification pathologies in the internet
AU - Custura, Ana
AU - Secchi, Raffaello
AU - Fairhurst, Godred
N1 - This work is funded by the European Unions Horizon 2020 research and innovation programme under grant agreement no. 644399 (MONROE) through the Open Call and grant agreement no. 644334 (NEAT). The views expressed are solely those of the author(s). The European Commission is not responsible for any use that may be made of that information.
PY - 2018/9
Y1 - 2018/9
N2 - The differentiated service architecture (DiffServ) provides a means for network devices to classify traffic based on the DiffServ codepoint (DSCP) and to map the traffic to a specific QoS forwarding treatment. Successful use beyond the local network depends on consistent remarking and forwarding of the DSCP value inside and at the boundaries of DiffServ domains. This paper provides the results of a new widescale measurement campaign to examine how the DSCP value is altered as packets travel along a set of Internet paths. This allows us to infer whether a packet is likely to receive an appropriate QoS treatment and to comment the opportunities for more widely deploying DiffServ QoS. Our results identify a set of remarking pathologies, revealing that many deployed routers continue to use the previous semantics of the deprecated Type of Service (ToS) field. We also note that is not common to observe clearing of the bits in the DiffServ field, as previously believed for routers in the core of the Internet, although this varies significantly depending on the type of network studied. Our results are related to recent IETF work that recommends use of specific DSCP values.
AB - The differentiated service architecture (DiffServ) provides a means for network devices to classify traffic based on the DiffServ codepoint (DSCP) and to map the traffic to a specific QoS forwarding treatment. Successful use beyond the local network depends on consistent remarking and forwarding of the DSCP value inside and at the boundaries of DiffServ domains. This paper provides the results of a new widescale measurement campaign to examine how the DSCP value is altered as packets travel along a set of Internet paths. This allows us to infer whether a packet is likely to receive an appropriate QoS treatment and to comment the opportunities for more widely deploying DiffServ QoS. Our results identify a set of remarking pathologies, revealing that many deployed routers continue to use the previous semantics of the deprecated Type of Service (ToS) field. We also note that is not common to observe clearing of the bits in the DiffServ field, as previously believed for routers in the core of the Internet, although this varies significantly depending on the type of network studied. Our results are related to recent IETF work that recommends use of specific DSCP values.
U2 - 10.1016/j.comcom.2018.05.016
DO - 10.1016/j.comcom.2018.05.016
M3 - Article
SN - 0140-3664
VL - 127
SP - 86
EP - 94
JO - Computer Communications
JF - Computer Communications
ER -
