创建1000个macvlan，ping本地ip失败
我想用不同的ip创建1000个macvlan。并使用ip rule路由不同的公共ip到多个接口的互联网。
首先创建1000 macvlan：
ip link add link eth0 address %02x:%02x:%02x:%02x:%02x:%02x eth0_%d type macvlan
%02x是mac地址，%d是0-999.
然后使用ifconfig设置每个macvlan不同的公共ip。最后，使用ip规则：
ip route add default via ${router} dev ${interface} src ${ip} table ${interfaceidx}
ip rule add from ${ip} table ${interfaceidx}每个macvlan将添加一个规则和一个表。
使用另一个服务器ping任何macvlan ip都可以。
root@ubuntu:/tmp# ping 222.217.107.102
PING 222.217.107.102 (222.217.107.102) 56(84) bytes of data.
64 bytes from 222.217.107.102: icmp_seq=1 ttl=56 time=57.5 ms
64 bytes from 222.217.107.102: icmp_seq=2 ttl=56 time=58.0 ms
64 bytes from 222.217.107.102: icmp_seq=3 ttl=56 time=60.1 ms
64 bytes from 222.217.107.102: icmp_seq=4 ttl=56 time=57.5 ms但是主机中的ping macvlan会丢弃数据包：
[root@localhost ~]# ping 222.217.107.102
PING 222.217.107.102 (222.217.107.102) 56(84) bytes of data.
64 bytes from 222.217.107.102: icmp_seq=1 ttl=64 time=0.124 ms
ping: sendmsg: Invalid argument
64 bytes from 222.217.107.102: icmp_seq=3 ttl=64 time=0.049 ms
ping: sendmsg: Invalid argumentping 127.0.0.1也将丢弃数据包：
[root@localhost ~]# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
ping: sendmsg: Invalid argument
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.050 ms
ping: sendmsg: Invalid argument
ping: sendmsg: Invalid argument
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.061 ms
ping: sendmsg: Invalid argument
ping: sendmsg: Invalid argument
ping: sendmsg: Invalid argument
[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-957.10.1.el7.x86_64 #1 SMP Mon Mar 18 15:06:45 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux我想我的路由表没问题。其他pc ping是ok.Modern Linux内核，它支持4294967295个表is，实现为32位长的rtnetlink属性RTA_TABLE。https://bird.network.cz/pipermail/bird-users/2013-November/008706.html
327654: from 113.15.163.120 lookup 1429
327655: from 113.15.163.121 lookup 1511
327656: from 113.15.163.122 lookup 1522
327657: from 113.15.163.123 lookup 1186
327658: from 113.15.163.125 lookup 1513
327659: from 113.15.163.124 lookup 1190
327660: from all lookup main
327670: from all lookup default回答 1
Server Fault用户
发布于 2019-04-09 04:00:19
linux默认的arp表是1000。
net.ipv4.neigh.default.gc_thresh1 = 8192
net.ipv4.neigh.default.gc_thresh2 = 32768
net.ipv4.neigh.default.gc_thresh3 = 655361000元会导致arp丢失，所以ping会下降。在sysctl.conf中添加这一行。sysctl -p。
https://serverfault.com/questions/961596
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