reject-with icmp-port-unreachable 是iptables 防火墙规则中的一个选项,用于在拒绝网络流量时,向发起请求的客户端返回一个 ICMP(Internet Control Message Protocol)消息,具体为“目标端口不可达”(ICMP Port Unreachable)。这是一种网络层的错误消息,表明目标端口当前不接受连接请求。 2. 阐述在何种情境下会使用"rejec...
icmp-proto-unreachable icmp-net-prohibited icmp-host-pro-hibited icmp-admin-prohibited 1. 2. 3. 4. 5. 6. 7. 8. 当没有明确设置--reject-with的值时,默认提示信息为icmp-port-unreachable,即端口不可达之意。 此时在另一台主机上向主机139发起ping请求,如下图所示,提示目标端口不可达。 那么我们将...
1 0 0 REJECT tcp -- * * 172.16.0.115 172.16.0.113 reject-with icmp-port-unreachable 2 0 0 REJECT tcp -- * * 172.16.0.116 172.16.0.113 reject-with icmp-port-unreachable 1. 2. 3. 4. 5. 6. 7. “逗号”两侧均不能包含空格,多个IP之间必须与逗号相连。 还能指定某个网段 iptables -I IN...
--reject-withtypeThetypegivencanbeicmp-net-unreachable,icmp-host-unreach-able,icmp-port-unreachable,icmp-proto-unreachable,icmp-net-prohibited,icmp-host-prohibitedoricmp-... --reject-with type The type given can be icmp-net-unreachable, icmp-host-unreach- able, icmp-port-unreachable, icmp-proto...
REJECT reject-with icmp-proto-unreachable is valid ipv4, but not ipv6 ipv4: root@host:~# iptables -j REJECT -h | grep "Valid reject types" -A 17 Valid reject types: icmp-net-unreachable ICMP network unreachable net-unreach alias icmp-host-unreachable ICMP host unreachable host-unreach alias...
查明原因为主机B开启了iptables防火墙,开启对应端口允许访问规则即可,记录本文主要原因是新增放通规则时用的iptables -A,新规则追加到了(A INPUT -j REJECT --reject-with icmp-host-prohibited)这条规则至下,导致65005端口依然无法被访问,查明原因做次记录。
[none], proto ICMP (1), length88)10.251.0.1>10.251.0.47: ICMP host10.107.2.145unreachable - admin prohibited, length68(tos0x0, ttl63, id19938, offset0, flags [DF], proto TCP (6), length60)10.251.0.47.35644>10.107.2.145.5443: Flags [S], cksum0x1854(incorrect ->0x1554), seq...
icmp-host-unreachable icmp-port-unreachable icmp-proto-unreachable icmp-net-prohibited icmp-host-prohibited or icmp-admin-prohibited (*) 这样子的话,就知道不通的条件,就会返回不通的包 第一种情况: 注释掉在/etc/sysconfig/iptables -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j...
拦截网络也是类似的: iptables -A INPUT -i $IF_PUB -s 10.67.232.0/24 -jREJECT --reject-with icmp-net-prohibited这条规则拒绝到达公网接口的、源地址为10.67.232.0/24的网络。这次该传输的发送方会收到一条ICMP网络禁止的消息。
[none], proto ICMP (1), length88)10.251.0.1>10.251.0.47: ICMP host10.107.2.145unreachable - admin prohibited, length68(tos0x0, ttl63, id19939, offset0, flags [DF], proto TCP (6), length60)10.251.0.47.35644>10.107.2.145.5443: Flags [S], cksum0x1854(incorrect ->0x1127), seq...