Re: [nft 0.9.3 | kernel 5.4.48] cannot get NAT to work

[ѽ҉ᶬḳ℠ <vtol@xxxxxxx>]

On 23/06/2020 21:23, Florian Westphal wrote:
> ѽ҉ᶬḳ℠ <vtol@xxxxxxx> wrote:
> > Since the ruleset that worked with kernel 4.19 did not anymore with kernel
> > 5.4 (throwing segfault) I started from scratch to see what gives.
> >
> > nft add table inet filter
> > nft add chain inet filter input { type filter hook input priority 0 \; }
> > nft add chain inet filter forward { type filter hook forward priority 0 \; }
> > nft add chain inet filter output    { type filter hook output priority 0 \;
> > }
> > nft add table inet nat
> >
> > Thus far good and then things go awry and the output does not help to
> > understand what might be wrong:
> >
> > nft add chain inet nat prerouting { type nat hook prerouting priority \-100
> > \; }
> > nft: unrecognized option: 1
> If you use the shell, you should use single-quote for the entire
> arguments.  nft 'add chain ...'
>
> here, nft thinks you passed '-1' as an option.

Thanks for the pointer, I just copied that from the wiki though...

> > and next up
> >
> > nft add chain inet nat postrouting { type nat hook postrouting priority 100
> > \; }
> > Error: Could not process rule: No such file or directory
> inet nat depends on CONFIG_NF_TABLES_INET.

That is apparently enabled in the kernel

xzgrep NF_TABLES /proc/config.gz
CONFIG_NF_TABLES=m
CONFIG_NF_TABLES_SET=m
CONFIG_NF_TABLES_INET=y
CONFIG_NF_TABLES_NETDEV=y
CONFIG_NF_TABLES_IPV4=y
CONFIG_NF_TABLES_ARP=y
CONFIG_NF_TABLES_IPV6=y
CONFIG_NF_TABLES_BRIDGE=m

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