我想限制端口 5041 上除 10.2.3.4 之外的所有 IP 的流量
首先我授予端口 IP 的访问权限，如下所示：
iptables -A IN_public_allow -s 10.2.3.4 -p tcp -m tcp --dport 5041 -m conntrack --ctstate NEW -j ACCEPT
然后我限制了所有 IP 的访问：
iptables -A IN_public_allow -p tcp -m tcp --dport 5041 -m conntrack --ctstate NEW -j DROP
因此从理论上讲，我应该只能从 IP 10.2.3.4 访问该端口，但事实并非如此。我使用 ncat 进行测试，通过使用 -s 选项来更改源地址：
ncat.exe -s 10.2.3.5 -zv 10.78.21.51 5041
libnsock mksock_bind_addr(): Bind to 10.2.3.5:0 failed (IOD #1): The requested address is not valid in its context. (10049)
Ncat: Connected to :10.78.21.51:5041.
Ncat: 0 bytes sent, 0 bytes received in 0.12 seconds
因此，该命令看起来像是从 IP 10.2.3.5 连接到端口，尽管它不应该如此。我不知道libnsock mksock_bind_addr(): Bind to 10.2.3.5:0 failed错误是什么意思。请帮忙，谢谢。
iptables -xvnL编辑：根据要求输出命令：
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
642614522 702873881336 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
454146 27240797 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
392972 20241510 INPUT_direct all -- * * 0.0.0.0/0 0.0.0.0/0
392972 20241510 INPUT_ZONES_SOURCE all -- * * 0.0.0.0/0 0.0.0.0/0
392972 20241510 INPUT_ZONES all -- * * 0.0.0.0/0 0.0.0.0/0
3 120 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate INVALID
4070 483366 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_direct all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_IN_ZONES_SOURCE all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_IN_ZONES all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_OUT_ZONES_SOURCE all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FORWARD_OUT_ZONES all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate INVALID
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 326255 packets, 205303698 bytes)
pkts bytes target prot opt in out source destination
488899038 266093163662 OUTPUT_direct all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FORWARD_IN_ZONES (1 references)
pkts bytes target prot opt in out source destination
0 0 FWDI_public all -- bond1 * 0.0.0.0/0 0.0.0.0/0 [goto]
0 0 FWDI_public all -- bond0 * 0.0.0.0/0 0.0.0.0/0 [goto]
0 0 FWDI_public all -- + * 0.0.0.0/0 0.0.0.0/0 [goto]
Chain FORWARD_IN_ZONES_SOURCE (1 references)
pkts bytes target prot opt in out source destination
Chain FORWARD_OUT_ZONES (1 references)
pkts bytes target prot opt in out source destination
0 0 FWDO_public all -- * bond1 0.0.0.0/0 0.0.0.0/0 [goto]
0 0 FWDO_public all -- * bond0 0.0.0.0/0 0.0.0.0/0 [goto]
0 0 FWDO_public all -- * + 0.0.0.0/0 0.0.0.0/0 [goto]
Chain FORWARD_OUT_ZONES_SOURCE (1 references)
pkts bytes target prot opt in out source destination
Chain FORWARD_direct (1 references)
pkts bytes target prot opt in out source destination
Chain FWDI_public (3 references)
pkts bytes target prot opt in out source destination
0 0 FWDI_public_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDI_public_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDI_public_allow all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
Chain FWDI_public_allow (1 references)
pkts bytes target prot opt in out source destination
Chain FWDI_public_deny (1 references)
pkts bytes target prot opt in out source destination
Chain FWDI_public_log (1 references)
pkts bytes target prot opt in out source destination
Chain FWDO_public (3 references)
pkts bytes target prot opt in out source destination
0 0 FWDO_public_log all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDO_public_deny all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 FWDO_public_allow all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FWDO_public_allow (1 references)
pkts bytes target prot opt in out source destination
Chain FWDO_public_deny (1 references)
pkts bytes target prot opt in out source destination
Chain FWDO_public_log (1 references)
pkts bytes target prot opt in out source destination
Chain INPUT_ZONES (1 references)
pkts bytes target prot opt in out source destination
4307 492298 IN_public all -- bond1 * 0.0.0.0/0 0.0.0.0/0 [goto]
388631 19744052 IN_public all -- bond0 * 0.0.0.0/0 0.0.0.0/0 [goto]
34 5160 IN_public all -- + * 0.0.0.0/0 0.0.0.0/0 [goto]
Chain INPUT_ZONES_SOURCE (1 references)
pkts bytes target prot opt in out source destination
Chain INPUT_direct (1 references)
pkts bytes target prot opt in out source destination
Chain IN_public (3 references)
pkts bytes target prot opt in out source destination
392972 20241510 IN_public_log all -- * * 0.0.0.0/0 0.0.0.0/0
392972 20241510 IN_public_deny all -- * * 0.0.0.0/0 0.0.0.0/0
392972 20241510 IN_public_allow all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
Chain IN_public_allow (1 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:3179 ctstate NEW
2477 145924 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEW
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:5534 ctstate NEW
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:5524 ctstate NEW
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:8434 ctstate NEW
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:5056 ctstate NEW
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:3189 ctstate NEW
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:443 ctstate NEW
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 ctstate NEW
0 0 ACCEPT tcp -- * * 10.2.3.4 0.0.0.0/0 tcp dpt:5041 ctstate NEW
5 260 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:5041 ctstate NEW
Chain IN_public_deny (1 references)
pkts bytes target prot opt in out source destination
Chain IN_public_log (1 references)
pkts bytes target prot opt in out source destination
Chain OUTPUT_direct (1 references)
pkts bytes target prot opt in out source destination
答案1
好的，经过一些检查，我发现 iptables 规则完全按照我的要求过滤了 ip 数据包，问题是 netcat 命令ncat.exe -s 10.2.3.5 -zv 10.78.21.51 5041实际上并没有像“-s”选项那样更改源地址，它仍然使用默认源地址。有人知道如何使用不同的源地址进行 telnet 吗？这可能吗？