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Accepted
Alex
Asked: 2020-04-04 11:40:13 +0800 CST

iptables 端口转发不适用于 libvirtd VM

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出于某种原因，我无法从外界连接到我在 VM 内的服务器，但我绝对可以从虚拟机管理程序连接到我的服务器。服务器应用程序在端口 27500 和 27015 上运行。我对 iptables 有点缺乏经验，所以可能是我做了一些明显的错误。这是我的 iptables-save：

[root@FW-H01 ~]# iptables-save
# Generated by iptables-save v1.8.4 on Fri Apr  3 21:34:51 2020
*mangle
:PREROUTING ACCEPT [10974504:113682765318]
:INPUT ACCEPT [9998403:109052061915]
:FORWARD ACCEPT [963508:4628352252]
:OUTPUT ACCEPT [11423761:2389165771]
:POSTROUTING ACCEPT [12387067:7017507319]
:LIBVIRT_PRT - [0:0]
-A POSTROUTING -j LIBVIRT_PRT
-A LIBVIRT_PRT -o virbr0 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
COMMIT
# Completed on Fri Apr  3 21:34:51 2020
# Generated by iptables-save v1.8.4 on Fri Apr  3 21:34:51 2020
*nat
:PREROUTING ACCEPT [7429:1219873]
:INPUT ACCEPT [1302:77639]
:OUTPUT ACCEPT [321:22443]
:POSTROUTING ACCEPT [321:22443]
:LIBVIRT_PRT - [0:0]
-A PREROUTING -d 116.202.163.214/32 -p tcp -m tcp --dport 27500 -j DNAT --to-destination 192.168.122.233:27500
-A PREROUTING -d 116.202.163.214/32 -p tcp -m tcp --dport 27015 -j DNAT --to-destination 192.168.122.233:27015
-A PREROUTING -d 116.202.163.214/32 -p udp -m udp --dport 27015 -j DNAT --to-destination 192.168.122.233:27015
-A PREROUTING -d 116.202.163.214/32 -p udp -m udp --dport 27500 -j DNAT --to-destination 192.168.122.233:27500
-A POSTROUTING -j LIBVIRT_PRT
-A POSTROUTING -s 192.168.122.233/32 -p tcp -m tcp --sport 27500 -j SNAT --to-source 116.202.163.214
-A POSTROUTING -s 192.168.122.233/32 -p tcp -m tcp --sport 27015 -j SNAT --to-source 116.202.163.214
-A POSTROUTING -s 192.168.122.233/32 -p udp -m udp --sport 27015 -j SNAT --to-source 116.202.163.214
-A POSTROUTING -s 192.168.122.233/32 -p udp -m udp --sport 27500 -j SNAT --to-source 116.202.163.214
-A LIBVIRT_PRT -s 192.168.122.0/24 -d 224.0.0.0/24 -j RETURN
-A LIBVIRT_PRT -s 192.168.122.0/24 -d 255.255.255.255/32 -j RETURN
-A LIBVIRT_PRT -s 192.168.122.0/24 ! -d 192.168.122.0/24 -p tcp -j MASQUERADE --to-ports 1024-65535
-A LIBVIRT_PRT -s 192.168.122.0/24 ! -d 192.168.122.0/24 -p udp -j MASQUERADE --to-ports 1024-65535
-A LIBVIRT_PRT -s 192.168.122.0/24 ! -d 192.168.122.0/24 -j MASQUERADE
COMMIT
# Completed on Fri Apr  3 21:34:51 2020
# Generated by iptables-save v1.8.4 on Fri Apr  3 21:34:51 2020
*filter
:INPUT ACCEPT [173397:141627735]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [164473:257858146]
:LIBVIRT_FWI - [0:0]
:LIBVIRT_FWO - [0:0]
:LIBVIRT_FWX - [0:0]
:LIBVIRT_INP - [0:0]
:LIBVIRT_OUT - [0:0]
-A INPUT -j LIBVIRT_INP
-A FORWARD -j LIBVIRT_FWX
-A FORWARD -j LIBVIRT_FWI
-A FORWARD -j LIBVIRT_FWO
-A FORWARD -d 192.168.122.233/32 -p tcp -m state --state NEW,RELATED,ESTABLISHED -m tcp --dport 27500 -j ACCEPT
-A FORWARD -d 192.168.122.233/32 -p tcp -m state --state NEW,RELATED,ESTABLISHED -m tcp --dport 27015 -j ACCEPT
-A FORWARD -d 192.168.122.233/32 -p udp -m state --state NEW,RELATED,ESTABLISHED -m udp --dport 27015 -j ACCEPT
-A FORWARD -d 192.168.122.233/32 -p udp -m state --state NEW,RELATED,ESTABLISHED -m udp --dport 27500 -j ACCEPT
-A OUTPUT -j LIBVIRT_OUT
-A LIBVIRT_FWI -d 192.168.122.0/24 -o virbr0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A LIBVIRT_FWI -o virbr0 -j REJECT --reject-with icmp-port-unreachable
-A LIBVIRT_FWO -s 192.168.122.0/24 -i virbr0 -j ACCEPT
-A LIBVIRT_FWO -i virbr0 -j REJECT --reject-with icmp-port-unreachable
-A LIBVIRT_FWX -i virbr0 -o virbr0 -j ACCEPT
-A LIBVIRT_INP -i virbr0 -p udp -m udp --dport 53 -j ACCEPT
-A LIBVIRT_INP -i virbr0 -p tcp -m tcp --dport 53 -j ACCEPT
-A LIBVIRT_INP -i virbr0 -p udp -m udp --dport 67 -j ACCEPT
-A LIBVIRT_INP -i virbr0 -p tcp -m tcp --dport 67 -j ACCEPT
-A LIBVIRT_OUT -o virbr0 -p udp -m udp --dport 53 -j ACCEPT
-A LIBVIRT_OUT -o virbr0 -p tcp -m tcp --dport 53 -j ACCEPT
-A LIBVIRT_OUT -o virbr0 -p udp -m udp --dport 68 -j ACCEPT
-A LIBVIRT_OUT -o virbr0 -p tcp -m tcp --dport 68 -j ACCEPT
COMMIT
# Completed on Fri Apr  3 21:34:51 2020

任何人都可以看到任何不正常的东西吗？请注意，大多数规则是由 libvirtd 生成的，我不确定这与我的规则之间是否存在任何中断的交互，或者如果我使用 libvirtd NAT 设置，我是否应该完全不同地做这件事. 让我知道是否需要添加其他信息。非常欢迎任何想法，我一直在努力解决这个问题好几个小时，谢谢！

virtualization networking iptables libvirt

1 个回答

  1. Best Answer

    这里的问题来自以下链：

    -A LIBVIRT_FWI -o virbr0 -j REJECT --reject-with icmp-port-unreachable
-A LIBVIRT_FWO -i virbr0 -j REJECT --reject-with icmp-port-unreachable

    如果转发模式设置为“nat”，则它们由 libvirtd 根据 libvirt 中的网络配置添加。

    一种可能的解决方案是将模式更改为“打开”，请小心，因为您必须通过这样做手动添加转发规则。

    # virsh net-edit default

<network>
  <name>default</name>
  <uuid>......</uuid>
  <forward mode='open'/>
   .............
    • 1

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