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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