Tested, default format must not be blanked. README reworded.

travelping · Mar 5, 2019 · 2c5bfa2 · 2c5bfa2
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diff --git a/Dockerfile b/Dockerfile
@@ -9,7 +9,7 @@ ENV IFACE="any"
 ENV MAXFILESIZE="1000"
 ENV MAXFILENUM="10"
 ENV FILENAME="dump"
-ENV FORMAT=""
+ENV FORMAT="pcapng"
 
 USER root:root
 

diff --git a/README.md b/README.md
@@ -42,9 +42,9 @@ The `FILENAME` variable sets the filename that is used. The default value is
 information). To dump on multiple interfaces simply add more interfaces to this 
 variable seperated by a whitespace (e.g. "eth0 eth1").
 
-The `FORMAT` variable sets the format of the written file. Use the variable `dump.pcap` as
-the `FILENAME` option and `pcap` for `FILENAME` to use the common pcap-format. Other formats are described in
-the [official documentation](https://www.wireshark.org/docs/man-pages/tshark.html).
+`FORMAT` sets the file-format of the written trace. Note that when you're setting
+the `FORMAT` to `pcap` for example, the `FILENAME` has to be changed to `dump.pcap`.
+Other formats are described in the [official tshark documentation](https://www.wireshark.org/docs/man-pages/tshark.html).
 
 Example: