Network troubleshooting: Difference between revisions
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[[Category:Networking|Troubleshooting]] | |||
=Network troubleshooting= | =Network troubleshooting= | ||
==Find open ports== | |||
===lsof=== | |||
Show all open IPv4/IPv6/both TCP ports: | |||
<syntaxhighlight lang=bash> | |||
# lsof -Pni 4TCP -sTCP:LISTEN | |||
# lsof -Pni 6TCP -sTCP:LISTEN | |||
# lsof -Pni -sTCP:LISTEN | |||
</syntaxhighlight> | |||
Show all open IPv4/IPv6/both addresses and applications listening on TCP port https(443): | |||
<syntaxhighlight lang=bash> | |||
# lsof -Pni 4TCP:443 -sTCP:LISTEN | |||
# lsof -Pni 6TCP:443 -sTCP:LISTEN | |||
# lsof -Pni TCP:443 -sTCP:LISTEN | |||
</syntaxhighlight> | |||
==Testing connections from virtual interfaces / virtual IPs== | ==Testing connections from virtual interfaces / virtual IPs== | ||
=== Ping === | === Ping === | ||
< | <syntaxhighlight lang=bash> | ||
# ping -I <your virtual ip> <destination> | # ping -I <your virtual ip> <destination> | ||
</ | </syntaxhighlight> | ||
On Solaris | |||
<syntaxhighlight lang=bash> | |||
# ping -sni <your virtual ip> <destination> | |||
</syntaxhighlight> | |||
=== Traceroute === | === Traceroute === | ||
< | <syntaxhighlight lang=bash> | ||
# traceroute -s <your virtual ip> <destination> | # traceroute -s <your virtual ip> <destination> | ||
</ | </syntaxhighlight> | ||
=== SSH === | === SSH === | ||
< | <syntaxhighlight lang=bash> | ||
# ssh <user>@<destination> -o BindAddress=<your virtual ip> | # ssh <user>@<destination> -o BindAddress=<your virtual ip> | ||
</ | </syntaxhighlight> | ||
=== Telnet === | === Telnet === | ||
< | <syntaxhighlight lang=bash> | ||
# telnet -b <your virtual ip> <destination> | # telnet -b <your virtual ip> <destination> | ||
</ | </syntaxhighlight> | ||
== Interface details == | |||
=== Linux === | |||
<syntaxhighlight lang=bash> | |||
# ethtool -k eth1 | |||
Features for eth1: | |||
rx-checksumming: on | |||
tx-checksumming: on | |||
tx-checksum-ipv4: off [fixed] | |||
tx-checksum-ip-generic: on | |||
tx-checksum-ipv6: off [fixed] | |||
tx-checksum-fcoe-crc: off [fixed] | |||
tx-checksum-sctp: off [fixed] | |||
scatter-gather: on | |||
tx-scatter-gather: on | |||
tx-scatter-gather-fraglist: off [fixed] | |||
tcp-segmentation-offload: off | |||
tx-tcp-segmentation: off | |||
tx-tcp-ecn-segmentation: off [fixed] | |||
tx-tcp6-segmentation: off | |||
udp-fragmentation-offload: off [fixed] | |||
generic-segmentation-offload: off | |||
generic-receive-offload: on | |||
large-receive-offload: on | |||
rx-vlan-offload: on | |||
tx-vlan-offload: on | |||
ntuple-filters: off [fixed] | |||
receive-hashing: on | |||
highdma: on | |||
rx-vlan-filter: on [fixed] | |||
vlan-challenged: off [fixed] | |||
tx-lockless: off [fixed] | |||
netns-local: off [fixed] | |||
tx-gso-robust: off [fixed] | |||
tx-fcoe-segmentation: off [fixed] | |||
tx-gre-segmentation: off [fixed] | |||
tx-ipip-segmentation: off [fixed] | |||
tx-sit-segmentation: off [fixed] | |||
tx-udp_tnl-segmentation: off [fixed] | |||
fcoe-mtu: off [fixed] | |||
tx-nocache-copy: off | |||
loopback: off [fixed] | |||
rx-fcs: off [fixed] | |||
rx-all: off [fixed] | |||
tx-vlan-stag-hw-insert: off [fixed] | |||
rx-vlan-stag-hw-parse: off [fixed] | |||
rx-vlan-stag-filter: off [fixed] | |||
l2-fwd-offload: off [fixed] | |||
busy-poll: off [fixed] | |||
</syntaxhighlight> | |||
=== Solaris === | |||
Latest revision as of 13:33, 21 September 2023
Network troubleshooting
Find open ports
lsof
Show all open IPv4/IPv6/both TCP ports:
# lsof -Pni 4TCP -sTCP:LISTEN
# lsof -Pni 6TCP -sTCP:LISTEN
# lsof -Pni -sTCP:LISTEN
Show all open IPv4/IPv6/both addresses and applications listening on TCP port https(443):
# lsof -Pni 4TCP:443 -sTCP:LISTEN
# lsof -Pni 6TCP:443 -sTCP:LISTEN
# lsof -Pni TCP:443 -sTCP:LISTEN
Testing connections from virtual interfaces / virtual IPs
Ping
# ping -I <your virtual ip> <destination>
On Solaris
# ping -sni <your virtual ip> <destination>
Traceroute
# traceroute -s <your virtual ip> <destination>
SSH
# ssh <user>@<destination> -o BindAddress=<your virtual ip>
Telnet
# telnet -b <your virtual ip> <destination>
Interface details
Linux
# ethtool -k eth1
Features for eth1:
rx-checksumming: on
tx-checksumming: on
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: on
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: off
tx-tcp-segmentation: off
tx-tcp-ecn-segmentation: off [fixed]
tx-tcp6-segmentation: off
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: off
generic-receive-offload: on
large-receive-offload: on
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: on
highdma: on
rx-vlan-filter: on [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-ipip-segmentation: off [fixed]
tx-sit-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: off
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off [fixed]
busy-poll: off [fixed]
