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...
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...
icmp-port-unreachable 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...
发送了丢包 [root@centos7 ~]# iptables -t raw -j TRACE -p tcp --dport5443-d10.107.2.145-I PREROUTING1[root@centos7~]# iptables -t raw -j TRACE -p tcp --dport5443-d10.107.2.145-I OUTPUT1[root@centos7~]# tail /var/log/kern.debug.log -f | grep5443| grep10.107.2.145 [root@c...
--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...
When the asa would sent the correct icmp unreachable the bad guy feels like the server x is a normal system and there is no running service behind this port. I think that is a better prottection for server x. Thanks again, Lars 5 Helpful Reply Learn...
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 ACCEPT ...