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Editorial Team
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Asked: 2026-06-06T05:44:07+00:00

It turns out that iptables doesn’t handle leading zeros too well. As $machinenumber that

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It turns out that iptables doesn’t handle leading zeros too well. As $machinenumber that is used has to have a leading zero in it for other purposes, the idea is simply to create a new variable ($nozero) based on $machinenumber, where leading zeros are stripped away.

$machinenumber is a two-digit number between 01 and 24. Currently it’s 09

$machinetype is 74 for now and hasn’t caused any problems before.

What I have so far is:

nozero = (echo $machinenumber | sed 's/^0*//')
iptables -t nat -I POSTROUTING -s 10.($machinetype).($nozero).0/24 -j MASQUERADE

While I believe I’m on the right track, the code results in:

ERROR - Unknown string operation
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1 Answer

  1. Editorial Team

    you can also do

    machinenumber=$(expr $machinenumber + 0)
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