You need to specify the interface index after .1.3.6.1.2.1.2.2.1.10
and .1.3.6.1.2.1.2.2.1.16
. (Eg. if the index is 17, append .17
to both OIDs.)
Otherwise, the target server doesn't know which interface you want to return the traffic counter values for.
Servers and routers can have multiple interfaces, and they count the traffic on each interface separately. I can't tell you what the correct interface index should be; you'll have to look that up on the server/router yourself. Alternatively, you could use a GETNEXT request instead of GET, if you just want to return the traffic on the interface with lowest index. However, that might not necessarily be the right interface.