this article will concentrate on a diverse feature of firewall administration: listing the iptables rules. Assume that in your Linux server, you have recently unveiled NAT settings.
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self.logger.debug("Creating NAT rule for VM ID: %s"% self.vm_1.id)# Create NAT rulenat_rule = NATRule.create(self.apiclient, self.vm_1, self.services["natrule"], public_ip.id) nat_rules = list_nat_rules(self.apiclient, id=nat_rule.id) self.assertEqual(isinstance(nat_rules, l...
One of the ways to delete iptables rules is by rule specification. To do so, you can run theiptablescommand with the-Doption followed by the rule specification. If you want to delete rules using this method, you can use the output of the rules list,iptables -S, for some help. For ex...
iptables -F Similar to the list iptables rules, the user can replace 'INPUT' with the name of the chain they want to flush: iptables -F INPUT To delete all user-defined chains in the system, the user can employ the tactic given below. However, it is advised to use this command with...
Since NAT (Network Address Translation) can also be configured via iptables, you can use iptables to list the NAT rules: sudo iptables -t nat -n -L -v The output will be similar to the one below if there are no rules added:
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iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 1 -j REDIRECT --to-port 8081 Available since Linux 2.6.36. dccp[!] --source-port,--sport port[:port] [!] --destination-port,--dport port[:port] [!] --dccp-types mask Match when the DCCP packet type is one...
Example: iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 0 -j REDIRECT --to-port 8080 iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 1 -j REDIRECT --to-port 8081 Available since Linux 2.6.36. dccp [!] --source-port,--sport port[:port] ...
nftables重用了现有的netfilter子系统,例如现有的钩子基础设施、连接跟踪系统、NAT、用户空间队列和日志子系统。对于nftables,只需要扩展expression即可,用户自行编写expression,然后让nftables虚拟机执行它。nftables框架的数据结构如下所示: Table{ Chain[ Rule (expression1,expression2,expression3,...) | | |--> ...