Known to apply to the following Sophos product(s) and version(s)
Sophos UTM Sophos UTM v9Sophos UTM v8
Operating systems UTM Linux
Some ISPs, such as DeutscheTelekom, impose extra costs if they should route traffic with special ToS bits. This is an extra service because they provide such traffic automatically via their backbone. Some applications, such as telephony or IP TV, add ToS bits automatically to the IP Header without any chance to deactivate it via the GUI. As a result, the customer has to pay extra money each month because its not trackable. Generally these ToS Bits are filtered by DeutscheTelekom:
Normal-Service 0x00 Minimize-Cost 0x02 Maximize-Reliability 0x04 Maximize-Throughput 0x08 Minimize-Delay 0x10
Solution at the UTM Gateway to drop this traffic:
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