# dump files, loopback **URL:** \ **Category:** Zeek\ **Created:** [February 2, 2001, 3:35pm UTC](https://community.zeek.org/t/dump-files-loopback/119 "2001-02-02T15:35:02Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Anderssen\_Magnus](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@Anderssen\_Magnus](https://community.zeek.org/u/Anderssen_Magnus)\ **Post date:** [February 2, 2001, 3:35pm UTC](https://community.zeek.org/t/dump-files-loopback/119/1 "2001-02-02T15:35:02Z")
Hi again,   I've installed Bro on a machine with freeBSD4.2 ( libpcap0.5). Since I cannot connect the machine on the network where I am now, I would like test my policy. I've tried to start bro on the localhost interface. I am only using the standard conn.bro file modified a little bit : the only processing of event I do is to write the name of the event function. I works with bro\_init(). But nothing is logged ( I am not using the log module so it shoult appear in my terminal), but tcpdump 'sees' the traffic (telnet and ftp on localhost).   I've also tried to read from a dump file of tcpdump (tcpdump -i lo0 -w filename), but I get this kind of output :   ...   weird: 981105864.406810 bad\_IP\_cheksum   ... I've tried to read the file with tcpdump (-r filename) and it works. So I thought that maybe my localhost device does not format the packets correctly and tried to read a dump from another machine. But even tcpdump won't read these files (comming from a linux box). Do somebody have a raw dump for to try or even better a solution to my problem(s). Thanks, Magnus. ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/zeek/original/1X/f09d732bc2cc7c7cc7e35db67cf4e1d5233ce7a7.png) [@system](https://community.zeek.org/u/system)\ **Post date:** [May 6, 2022, 3:36pm UTC](https://community.zeek.org/t/dump-files-loopback/119/2 "2022-05-06T15:36:14Z")