Removal of `xt_u32` module in RHCOS 9.x

    4.14

    Every time

[root@sno10 ~]# cat /lib/modules/$(uname -r)/config | grep -i xt | grep -i u32
# CONFIG_NETFILTER_XT_MATCH_U32 is not set

The unsupported xt_u32 Netfilter module has been removed RHEL 8 contained the unsupported xt_u32 module, which enabled iptables users to match arbitrary 32 bits in the packet header or payload. This module has been removed from RHEL 9. As a replacement, use the nftables packet filtering framework. If no native match exists in nftables, use the raw payload matching feature of nftables. For details, see the raw payload expression section in the nft(8) man page.