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Date:   Mon, 1 Apr 2019 21:45:13 +0200
From:   Florian Westphal <fw@strlen.de>
To:     Jeffrin Thalakkottoor <jeffrin@rajagiritech.edu.in>
Cc:     Shuah Khan <shuah@kernel.org>, pablo@netfilter.org, fw@strlen.de,
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Subject: Re: about selftests/netfilter test related issue
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Jeffrin Thalakkottoor <jeffrin@rajagiritech.edu.in> wrote:
> i think the script nft_nat.sh  is assuming devices eth0 and eth1

No it does not.
These are arbitrary names given to veth devices.

> Error: Unknown device type.

No Veth device support in kernel?