aix:aix_net_testing
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aix:aix_net_testing [2023/09/11 15:53] manu [Test packet size (MTU)] |
aix:aix_net_testing [2023/09/11 16:37] (current) manu |
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| You can check the maximum packet size on network using ping | You can check the maximum packet size on network using ping | ||
| <cli prompt='#'> | <cli prompt='#'> | ||
| - | [root@testh]/root# ping -D -s 1470 nim01 | + | [root@testh]/root# ping -c2 -w 10 -s 1470 nim01 |
| 1478 bytes from 172.10.10.10: icmp_seq=2 ttl=64 time=0 ms | 1478 bytes from 172.10.10.10: icmp_seq=2 ttl=64 time=0 ms | ||
| 45 00 05 c6 c3 8f 00 00 40 01 32 51 ac 15 13 8b * E.......@.2Q.... | 45 00 05 c6 c3 8f 00 00 40 01 32 51 ac 15 13 8b * E.......@.2Q.... | ||
| Line 24: | Line 24: | ||
| </cli> | </cli> | ||
| + | If packet size are to high, you 'll have a packet lost 100% | ||
| + | <cli prompt='#'> | ||
| + | [root@testh]/root# ping -c2 -w 10 -D -s 9000 nim01 | ||
| + | PING nim01.lu (172.10.10.10): 1500 data bytes | ||
| + | |||
| + | --- nim01.lu ping statistics --- | ||
| + | 2 packets transmitted, 0 packets received, 100% packet loss | ||
| + | </cli> | ||
| + | |||
| + | Generate network trafic and check the packet size, here packet 1500, on NFS | ||
| + | <cli prompt='#'> | ||
| + | [root@testh]/root# tcpdump -i en1 -vvv host myserver.lu | ||
| + | 16:33:44.209433 IP (tos 0x0, ttl 60, id 20437, offset 0, flags [none], proto TCP (6), length 1500) | ||
| + | testh.lu.42305 > myserver.lu.shilp: Flags [.], cksum 0x0000 (incorrect -> 0xa6bb), seq 495870232:495871680, ack 4016785, win 65535, options [nop,nop,TS val 1698414524 ecr 4145383147], length 1448: NFS request xid 0 0 null | ||
| + | 16:33:44.209438 IP (tos 0x0, ttl 60, id 20438, offset 0, flags [none], proto TCP (6), length 1500) | ||
| + | testh.lu.42305 > myserver.lu.shilp: Flags [.], cksum 0x0000 (incorrect -> 0xa113), seq 495871680:495873128, ack 4016785, win 65535, options [nop,nop,TS val 1698414524 ecr 4145383147], length 1448: NFS request xid 0 0 null | ||
| + | 16:33:44.209445 IP (tos 0x0, ttl 60, id 20439, offset 0, flags [none], proto TCP (6), length 1500) | ||
| + | testh.lu.42305 > myserver.lu.shilp: Flags [.], cksum 0x0000 (incorrect -> 0x9b6b), seq 495873128:495874576, ack 4016785, win 65535, options [nop,nop,TS val 1698414524 ecr 4145383147], length 1448: NFS request xid 0 0 null | ||
| + | |||
| + | 29300 packets captured | ||
| + | 462059 packets received by filter | ||
| + | 432674 packets dropped by kernel | ||
| + | </cli> | ||
| - | | ||
| | | ||
| ==== Reset count in netstat ==== | ==== Reset count in netstat ==== | ||
aix/aix_net_testing.1694440425.txt.gz · Last modified: 2023/09/11 15:53 by manu
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