我带来了一个运行 Centos 6.4 的非托管 vps，唯一打开的端口是 22。我打开端口 20 和 21，这样我就可以进行 ftp，但每次我尝试它都不会保存并让我通过 filezilla 登录。
有什么建议么？
编辑：这就是我所做的
[root@itsonlyme ~]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT icmp -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ftp
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ftp-data
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ftp
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ftp-data
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ftp
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ftp-data
REJECT all -- anywhere anywhere reject-with icmp-host-prohibited
ACCEPT tcp -- anywhere anywhere tcp dpt:ftp ctstate NEW,ESTABLISHED /* Allow ftp connections on port 21 */
ACCEPT tcp -- anywhere anywhere tcp dpt:ftp-data ct state RELATED,ESTABLISHED /* Allow ftp connections on port 20 */
ACCEPT tcp -- anywhere anywhere tcp spts:1024:65535 dpts:1024:65535 ctstate ESTABLISHED /* Allow passive inbound connections */
Chain FORWARD (policy ACCEPT)
target prot opt source destination
REJECT all -- anywhere anywhere reject-with icmp-ho st-prohibited
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:ftp ctstate NEW,ESTABLISHED /* Allow ftp connections on port 21 */
ACCEPT tcp -- anywhere anywhere tcp dpt:ftp-data ct state ESTABLISHED /* Allow ftp connections on port 20 */
ACCEPT tcp -- anywhere anywhere tcp spts:1024:65535 dpts:1024:65535 ctstate RELATED,ESTABLISHED /* Allow passive inbound connection s */
[root@itsonlyme ~]# iptables --line -vnL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 5167 757K ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 3 134 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
3 0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
4 129 7628 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
5 8 404 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21
6 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:20
7 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21
8 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:20
9 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21
10 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:20
11 211 24114 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
12 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:21 ctstate NEW,ESTABLISHED /* Allow ftp connections on port 21 */
13 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:20 ctstate RELATED,ESTABLISHED /* Allow ftp connections on port 20 */
14 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp spts:1024:65535 dpts:1024:65535 ctstate ESTABLISHED /* Allow passive inbound connections */
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 4994 packets, 895K bytes)
num pkts bytes target prot opt in out source destination
1 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:21 ctstate NEW,ESTABLISHED /* Allow ftp connections on port 21 */
2 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:20 ctstate ESTABLISHED /* Allow ftp connections on port 20 */
3 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp spts:1024:65535 dpts:1024:65535 ctstate RELATED,ESTABLISHED /* Allow passive inbound connections */
[root@itsonlyme ~]# service iptables restart
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]
iptables: Loading additional modules: ip_conntrack_ftp [ OK ]
[root@itsonlyme ~]# reboot
Broadcast message from root@itsonlyme
(/dev/pts/0) at 6:37 ...
The system is going down for reboot NOW!
然后我做了这个
[root@itsonlyme ~]#
login as: root
[root@itsonlyme ~]# vi /etc/sysconfig/iptables-config
# Load additional iptables modules (nat helpers)
# Default: -none-
# Space separated list of nat helpers (e.g. 'ip_nat_ftp ip_nat_irc'), which
# are loaded after the firewall rules are applied. Options for the helpers are
# stored in /etc/modprobe.conf.
IPTABLES_MODULES="ip_conntrack_ftp"
# Unload modules on restart and stop
# Value: yes|no, default: yes
# This option has to be 'yes' to get to a sane state for a firewall
# restart or stop. Only set to 'no' if there are problems unloading netfilter
# modules.
IPTABLES_MODULES_UNLOAD="yes"
# Save current firewall rules on stop.
# Value: yes|no, default: no
# Saves all firewall rules to /etc/sysconfig/iptables if firewall gets stopped
# (e.g. on system shutdown).
IPTABLES_SAVE_ON_STOP="yes"
# Save current firewall rules on restart.
# Value: yes|no, default: no
# Saves all firewall rules to /etc/sysconfig/iptables if firewall gets
# restarted.
IPTABLES_SAVE_ON_RESTART="yes"
# Save (and restore) rule and chain counter.
# Value: yes|no, default: no
# Save counters for rules and chains to /etc/sysconfig/iptables if
# 'service iptables save' is called or on stop or restart if SAVE_ON_STOP or
# SAVE_ON_RESTART is enabled.
IPTABLES_SAVE_COUNTER="no"
# Numeric status output
# Value: yes|no, default: yes
# Print IP addresses and port numbers in numeric format in the status output.
IPTABLES_STATUS_NUMERIC="yes"
# Verbose status output
# Value: yes|no, default: yes
# Print info about the number of packets and bytes plus the "input-" and
# "outputdevice" in the status output.
IPTABLES_STATUS_VERBOSE="no"
# Status output with numbered lines
"/etc/sysconfig/iptables-config" 54L, 1992C
答案1
两件事情。
我知道这不是你问题的一部分，但是......更新您的系统。 6.4 太旧了，你一定会被拥有的。
您很可能需要转到 /etc/sysconfig/iptables-config 并修改该
IPTABLES_MODULES=""指令。添加时请务必注意正在加载的其他模块。IPTABLES_MODULES="... ip_conntrack_ftp"接下来，您可能应该
/etc/sysconfig/iptables手动修改该文件。在“DROP”或“REJECT”行之前，-A INPUT -p tcp -m tcp --dport 21 -j ACCEPT为两个端口添加类似...的内容，然后重新启动 iptables。
另外，下次请使用文本当提出你的问题时。该屏幕截图对于查看您的问题的任何人来说都太小了。