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CommView allows you to
capture traffic on the loopback interface. To start monitoring the
loopback interface, select it from the drop-down list in the
toolbar.
Loopback packets are the
packets sent/received within the same computer, i.e. self-addressed
packets. Typically, there is virtually no loopback traffic on the
standard PC. However, loopback traffic is widely used by software
developers for debugging network-related applications. Therefore,
CommView's loopback capturing functionality is targeted primarily
at this user group.
When you capture loopback
traffic, the packets look exactly as any other network packets,
except that the checksums are not computed. Please pay attention to
the following peculiarities when capturing loopback traffic:
·CommView captures loopback
traffic on all of the local IP addresses. This always includes
127.0.0.1/255.0.0.0, but may also include the IP addresses of your
Ethernet adapters, e.g. 192.168.0.1.
·ICMP
packets cannot be captured. Other IP protocols can (TCP, UDP,
etc.).
·Only
successfully sent/received packets are captured. For example, if a
connection attempt fails because the destination port is closed,
you will not see any SYN / RST packets.
·Sessions are silently
closed; no FIN packets are captured.
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