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Centos8 不响应 IGMP v2 成员资格查询

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Centos8 不响应 IGMP v2 成员资格查询

在解决一般问题时，为什么Centos 8盒子发送JOIN后收不到组播数据，使用wireshark进行分析还显示Centos盒子没有响应IGMP v2成员资格查询。

在这种情况下，多播地址 225.1.1.3 已加入，可以通过以下方式确认netstat -g：

# netstat -g
IPv6/IPv4 Group Memberships
Interface       RefCnt Group
--------------- ------ ---------------------
lo              1      224.0.0.1
eth0            1      224.0.0.1
eth1            1      225.1.1.3

与中的信息匹配/proc/net/igmp

# cat /proc/net/igmp
Idx     Device    : Count Querier       Group    Users Timer    Reporter
3       eth1      :     3      V3
                                030101E1     1 0:00000000               0
                                010101EF     1 0:00000000               0
                                010000E0     1 0:00000000               0

但很明显，它没有发送对 v2 成员资格查询消息的响应：

 1881 2544.437502942 192.168.105.253 → 225.1.1.3    IGMPv2 60 Membership Query, specific for group 225.1.1.3
 1883 2545.439116776 192.168.105.253 → 225.1.1.3    IGMPv2 60 Membership Query, specific for group 225.1.1.3
 1890 2555.526695862 192.168.105.253 → 224.0.0.1    IGMPv2 60 Membership Query, general
 1936 2615.525812650 192.168.105.253 → 224.0.0.1    IGMPv2 60 Membership Query, general
 1977 2675.524651646 192.168.105.253 → 224.0.0.1    IGMPv2 60 Membership Query, general
 1981 2680.487871978 192.168.105.253 → 225.1.1.3    IGMPv2 60 Membership Query, specific for group 225.1.1.3
 1983 2681.488403894 192.168.105.253 → 225.1.1.3    IGMPv2 60 Membership Query, specific for group 225.1.1.3
 1999 2702.808993240 192.168.117.21 → 224.0.0.22   IGMPv3 54 Membership Report / Leave group 225.1.1.3
 2000 2702.826998740 192.168.117.21 → 224.0.0.22   IGMPv3 54 Membership Report / Leave group 225.1.1.3
 2002 2704.929915370 192.168.117.21 → 224.0.0.22   IGMPv3 54 Membership Report / Join group 225.1.1.3 for any sources
 2003 2705.331977636 192.168.117.21 → 224.0.0.22   IGMPv3 54 Membership Report / Join group 225.1.1.3 for any sources
 2023 2735.523170767 192.168.105.253 → 224.0.0.1    IGMPv2 60 Membership Query, general
 2063 2795.522407972 192.168.105.253 → 224.0.0.1    IGMPv2 60 Membership Query, general

许多帖子提到禁用防火墙和/或设置路由。但防火墙已关闭，路由已添加。问题仍然存在。

如何配置 Centos8 来响应成员资格查询？

# systemctl status firewalld
● firewalld.service
   Loaded: masked (Reason: Unit firewalld.service is masked.)
   Active: inactive (dead)

# ip route
10.1.0.0/16 dev eth2 proto kernel scope link src 10.1.2.21
30.0.0.0/16 dev eth0 proto kernel scope link src 30.0.0.21
169.254.0.0/16 dev eth0 scope link metric 1002
169.254.0.0/16 dev eth1 scope link metric 1003
169.254.0.0/16 dev eth2 scope link metric 1004
169.254.0.0/16 dev eth3 scope link metric 1005 linkdown
192.168.2.0/24 dev eth3 proto kernel scope link src 192.168.2.21 linkdown
192.168.117.0/24 dev eth1 proto kernel scope link src 192.168.117.21
224.0.0.0/4 dev eth1 scope link
234.0.0.0/8 dev eth1 scope link
235.0.0.0/8 dev eth1 scope link
239.0.0.0/8 dev eth1 scope link

答案1

尽管我们已net.ipv4.conf.default.rp_filter设置为零，但事实证明完全禁用返回路径验证，我们需要将所有设置设置rp_filter为零（包括显式列出接口）。

我们在下面放置一个文件，/etc/sysctl.d如下所示：

# Set IGMP Version for eth1
# Set to '2' or '3' depending on what is enabled in the switch
net.ipv4.conf.eth1.force_igmp_version = 2

# Disable source route verification
# In addition to 90-torque.conf, also explicitly set eth1 to ignore
# return path validation
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.eth1.rp_filter = 0

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