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I installed iptraf-ng (v1.1.4) on ubuntu 18.04

sudo apt install iptraf-ng

But when I try to activate the "logging" option, iptraf freezes and the message comes out Floating Point Exception (in the image in Spanish Excepción de coma flotante)

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Additional information, apparently not related to the problem:

iptraf-ng does not create the default folder for log, so I must create it manually

sudo mkdir /var/log/iptraf-ng

enter image description here

crash:

enter image description here

Error research:

I have researched and propose a patch call 0001-BUGFIX-fix-Floating-point-exception-in-tcplog_flowra.patch (which is only for compilations)

Does someone know how to solve this problem?

Thanks in advance

Update:

the issue is fixed in iptraf-ng 1.2.1 release

PD: this folder needs to be created manually for the iface_stats_general.log to be generated

sudo mkdir /var/log/iptraf-ng
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2 Answers 2

Reset to default
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I had the same problem but if you force Promiscuous mode it works.

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  • No, actually, it doesnt always works fine. But with just one interface selected, i never had the bug until now.
    – Ulysse Schwartz
    Sep 23, 2019 at 19:14
  • Welcome to Ask Ubuntu! Regarding your comment: I recommend that you edit your answer to explain any important limitations you've found that apply to it.
    – Eliah Kagan
    Sep 25, 2019 at 7:32
  • Does not work for me - Forced Promiscuous and only one interface seleted.
    – gies0r
    Dec 28, 2020 at 16:50
  • Ubuntu 18.04 worked with iptraf-ng v1.1.4 and your answer is the solution. But, it is no longer necessary. In ubuntu 22.04 the iptraf-ng v1.2.1 bug was fixed
    – acgbox
    Oct 25, 2022 at 16:55
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Same issue. At first I noticed 'sudo apt install iptraf' leads to the package 'iptraf-ng'. Well after receiving the 'floating point exception error' I thought I should give 'lubuntu 16.04 LTS' a chance and it worked with 'iptraf' fine, but only if I choose the '/tmp' folder for storage!

Thought wrong I could do the same with my '18.04 LTS'.

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  • It does not work. In any folder that you put the iptrafxxx.log the same error occurs (in Ubuntu 18.04.x 64)
    – acgbox
    Nov 27, 2018 at 20:33

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