dd-wrtでOpenVPN (10)

ネットワーク
MTU (2)
下記を参考に変更、大きなパケットでも通るようになった。
https://vogel.at.webry.info/201504/article_10.html
サーバ(dd-wrt)側
項目 値
Tunnel MTU setting1400
Tunnel UDP Fragment1280
Tunnel UDP MSS-Fix/td>Enable

クライアント(Ubuntu)側
項目 値
Use custom tunnel Maximum Transmission Unit (MTU)1400
Use custom UDP fragment size1280
Restrict tunnel TCP Maximum Segment Size (MSS)y

結果
$ ping 10.10.1.1
PING 10.10.1.1 (10.10.1.1) 56(84) bytes of data.
64 bytes from 10.10.1.1: icmp_seq=1 ttl=64 time=2.95 ms
64 bytes from 10.10.1.1: icmp_seq=2 ttl=64 time=2.52 ms
^C
--- 10.10.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 2.525/2.737/2.950/0.218 ms
$ ping -s 1300 10.10.1.1
PING 10.10.1.1 (10.10.1.1) 1300(1328) bytes of data.
1308 bytes from 10.10.1.1: icmp_seq=1 ttl=64 time=2.73 ms
1308 bytes from 10.10.1.1: icmp_seq=2 ttl=64 time=3.09 ms
^C
--- 10.10.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 2.739/2.916/3.093/0.177 ms
$ ping -s 1400 10.10.1.1
PING 10.10.1.1 (10.10.1.1) 1400(1428) bytes of data.
1408 bytes from 10.10.1.1: icmp_seq=1 ttl=64 time=3.53 ms
1408 bytes from 10.10.1.1: icmp_seq=2 ttl=64 time=3.18 ms

--- 10.10.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 3.183/3.361/3.539/0.178 ms
$ ping -s 1500 10.10.1.1
PING 10.10.1.1 (10.10.1.1) 1500(1528) bytes of data.
1508 bytes from 10.10.1.1: icmp_seq=1 ttl=64 time=3.58 ms
1508 bytes from 10.10.1.1: icmp_seq=2 ttl=64 time=3.39 ms
1508 bytes from 10.10.1.1: icmp_seq=3 ttl=64 time=3.13 ms
1508 bytes from 10.10.1.1: icmp_seq=4 ttl=64 time=3.65 ms
^C
--- 10.10.1.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3007ms
rtt min/avg/max/mdev = 3.137/3.441/3.652/0.198 ms
$ ping -s 2000 10.10.1.1
PING 10.10.1.1 (10.10.1.1) 2000(2028) bytes of data.
2008 bytes from 10.10.1.1: icmp_seq=1 ttl=64 time=3.46 ms
2008 bytes from 10.10.1.1: icmp_seq=2 ttl=64 time=7.05 ms
^C
--- 10.10.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 3.460/5.255/7.050/1.795 ms
$ ping -M do -s 2000 10.10.1.1
PING 10.10.1.1 (10.10.1.1) 2000(2028) bytes of data.
ping: local error: Message too long, mtu=1400
ping: local error: Message too long, mtu=1400
ping: local error: Message too long, mtu=1400
^C
--- 10.10.1.1 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2032ms
$ ping -M dont -s 2000 10.10.1.1
PING 10.10.1.1 (10.10.1.1) 2000(2028) bytes of data.
2008 bytes from 10.10.1.1: icmp_seq=1 ttl=64 time=4.00 ms
2008 bytes from 10.10.1.1: icmp_seq=2 ttl=64 time=4.46 ms
^C
--- 10.10.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 4.003/4.232/4.462/0.238 ms
(とりあえず了) (つづく）