Re: I need iptables ftp nat help

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On 08/23/2018 11:23 AM, ToddAndMargo wrote:
On 08/23/2018 11:10 AM, Rick Stevens wrote:
On 08/22/2018 06:00 PM, ToddAndMargo wrote:
On 08/22/2018 04:37 PM, Ed Greshko wrote:
On 08/23/18 06:47, ToddAndMargo wrote:
Hi All,

My iptables firewall ported from RHEL won't connect to ftp sites
and throws this error (written by me years ago):


      WARNING: active FTP rules have been selected but one or
      more necessary modules have not been detected

      In /etc/sysconfig/iptables-config, you must add ip_nat_ftp
      and ip_conntrack_ftp to IPTABLES_MODULES. Delimiter is a
      space.  For example:
           IPTABLES_MODULES=ip_nat_ftp ip_conntrack_ftp

      To load changes, use:
           # /etc/rc.d/init.d/iptables restart
           # systemctl restart iptables

      To check if modules are loaded, use
           lsmod


1) is Fedora doing FTP differently in iptables?

2) where do I find
          ip_nat_ftp
          ip_conntrack_ftp
     now a days?


I can't locate my notes at the moment.  But I believe the way things
are done in the
netfilter framework has changed.

If memory servers me the nf_conntrack_ipv4 will load, as needed, the
necessary
"helper".  I use the standard firewall and these modules are loaded.

xt_conntrack           16384  21
nf_conntrack_ipv6      16384  12
nf_defrag_ipv6         20480  1 nf_conntrack_ipv6
nf_conntrack_ipv4      16384  11
nf_defrag_ipv4         16384  1 nf_conntrack_ipv4
nf_conntrack          147456  6
xt_conntrack,nf_conntrack_ipv6,nf_conntrack_ipv4,nf_nat,nf_nat_ipv6,nf_nat_ipv4

libcrc32c              16384  2 nf_conntrack,nf_nat

and ftp works fine.

ip_nat_ftp does not exist on my system.  But I do have nf_conntrack_ftp.

I see nf_conntrack_ftp inserted

# lsmod | grep nf_conntrack_ftp
nf_conntrack_ftp       20480  1 nf_nat_ftp
nf_conntrack          147456  9
xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_ipv4,nf_nat,nf_nat_ftp,ipt_MASQUERADE,nf_nat_ipv4,xt_helper,nf_conntrack_ftp



But it is not following the high ports that ftp uses:

Aug 22 16:12:09 rn6 kernel: dsl-out Everything Else IN= OUT=eno2
SRC=192.168.xxx.yyy DST=208.106.xxx.yyy LEN=60 TOS=0x00 PREC=0x00 TTL=64
ID=25991 DF PROTO=TCP SPT=59698 DPT=21023 WINDOW=29200 RES=0x00 SYN URGP=0

Perhaps I missed this, but are you trying to set up an FTP _server_ on
your machine or using it as an FTP client? The firewall rules for an
FTP server would be significantly different--especially if you wish to
provide both passive and normal FTP operations.

Just ftp client and I want to support both active and passive mode


The advice given here:

https://serverfault.com/questions/203546/client-side-iptables-rule-to-allow-active-ftp
might be relevant.

:m
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