2.6 KiB
Network
Test hostname resolution with :manpage:getent(1), for example getent hosts www.psi.ch. Unlike :manpage:nslookup(1) or :manpage:dig(1), it uses the
system resolver.
The systems IP addresses and routes can be displayed using :manpage:ip(8)::
# ip address
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:50:56:9d:6d:03 brd ff:ff:ff:ff:ff:ff
inet 10.129.160.195/24 brd 10.129.160.255 scope global ens160
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:fe9d:6d03/64 scope link
valid_lft forever preferred_lft forever
# ip route
default via 10.129.160.1 dev ens160
10.129.160.0/24 dev ens160 proto kernel scope link src 10.129.160.195
169.254.0.0/16 dev ens160 scope link metric 1002
The link status and other information of an interface can be displayed using
:manpage:ethtool(8):
-
Link status::
ethtool ens160
Settings for ens160: [...] Speed: 10000Mb/s Duplex: Full [...] Link detected: yes
-
Statistics (driver-specific, but look for errors/discards/dropped)::
ethtool -S ens160
NIC statistics: Tx Queue#: 0 TSO pkts tx: 21529 TSO bytes tx: 91036062 ucast pkts tx: 1036632 ucast bytes tx: 235421707 mcast pkts tx: 8 mcast bytes tx: 648 bcast pkts tx: 7 bcast bytes tx: 294 pkts tx err: 0 pkts tx discard: 0 drv dropped tx total: 0 too many frags: 0 giant hdr: 0 hdr err: 0 tso: 0 ring full: 0 pkts linearized: 0 hdr cloned: 0 giant hdr: 0 Rx Queue#: 0 LRO pkts rx: 6913 LRO byte rx: 100534073 ucast pkts rx: 551554 ucast bytes rx: 161369441 mcast pkts rx: 4 mcast bytes rx: 344 bcast pkts rx: 753276 bcast bytes rx: 45787629 pkts rx OOB: 0 pkts rx err: 0 drv dropped rx total: 0 err: 0 fcs: 0 rx buf alloc fail: 0 tx timeout count: 0