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
is Fedora doing FTP differently in iptables?
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