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#1 2020-03-22 02:39:02

enihcam
Member
From: Internet
Registered: 2009-12-20
Posts: 207

High IpReasmReqds and IpReasmFails/IpReasmTimeout on my remote server

Hi archlinux folks,

I happened to see the IP packet reassembling works on my remote server are abnormally frequent and half of them failed due to time-out. Any ideas?

$ nstat
#365.1804289383 sampling_interval=10 time_const=60
IpInReceives                    1946750          205.1
IpInDelivers                    1945086          205.1
IpOutRequests                   1607500          203.3
*IpReasmTimeout                  1107               0.0
*IpReasmReqds                    2221               0.0
IpReasmOKs                      557                0.0
*IpReasmFails                    1107               0.0

Some other contexts:

$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 00:0d:3a:80:1f:10 brd ff:ff:ff:ff:ff:ff
3: enP14091s1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master eth0 state UP mode DEFAULT group default qlen 1000
    link/ether 00:0d:3a:80:1f:10 brd ff:ff:ff:ff:ff:ff

$ sysctl -a | grep mtu
net.ipv4.ip_forward_use_pmtu = 0
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.route.min_pmtu = 552
net.ipv4.route.mtu_expires = 600
net.ipv4.tcp_mtu_probe_floor = 48
net.ipv4.tcp_mtu_probing = 1

Thanks.

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