一个 iptables 的问题，求助下 - V2EX

一个 iptables 的问题，求助下 - V2EX

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发现群晖的 iptables filter 表的规则是下面这样的(删了不相关的 chain)，按 archiwiki 来说，QUICKCONNECT_RELAY 最后一条 drop 后，后续的 rule 和 chain 都不会执行了，怎么一个群晖的 https 请求还能通过 QUICKCONNECT_RELAY 后继续执行 INPUT_FIREWALL ？

Chain INPUT (policy ACCEPT) target prot opt source destination QUICKCONNECT_RELAY all -- anywhere anywhere INPUT_FIREWALL all -- anywhere anywhere Chain INPUT_FIREWALL (1 references) target prot opt source destination ACCEPT all -- anywhere anywhere ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED RETURN udp -- anywhere anywhere udp spt:41641 RETURN tcp -- anywhere anywhere multiport dports DSM-https,6690 RETURN udp -- anywhere anywhere udp dpt:41641 DROP all -- anywhere anywhere DROP all -- anywhere anywhere Chain QUICKCONNECT_RELAY (1 references) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:6690 ACCEPT tcp -- anywhere anywhere tcp dpt:DSM-https ACCEPT icmp -- anywhere anywhere DROP all -- anywhere anywhere

Supplement 1 Apr 3, 2024

用 iptables -nvL 看，QUICKCONNECT_RELAY 最后的 drop 规则确实有网卡限制。

Chain QUICKCONNECT_RELAY (1 references) pkts bytes target prot opt in out source destination 43542 31M ACCEPT tcp -- tun1000 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:6690 22127 3997K ACCEPT tcp -- tun1000 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:5001 424 15264 ACCEPT icmp -- tun1000 * 0.0.0.0/0 0.0.0.0/0 2952 487K DROP all -- tun1000 * 0.0.0.0/0 0.0.0.0/0

QUICKCONNECT_RELAY

4 replies 2024-04-02 10:14:19 +08:00

1

kkk9

Apr 2, 2024

你查看的信息缺失了一些不好判断，用 iptables -nvL 再看一下，drop all 和 accept all 并不一定是冲突的，比如 in 、out 、网卡什么的不一样

2

om2mo

Apr 2, 2024

iptables -A QUICKCONNECT_RELAY -j DROP
iptables -A QUICKCONNECT_RELAY -j RETURN

3

lrh3321

Apr 2, 2024

iptables -S 看看完整的吧，QUICKCONNECT_RELAY 最后一条的 DROP 应该有条件的，要不然你已有的 TCP 连接应该都被它 Drop 了。

4

kkkbbb

Apr 2, 2024

QUICKCONNECT_RELAY 的规则前面的满足后面的就不会执行了，继续判断下一个 chain 了吧

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