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Find the route and source IP for a destination

harmlessNetworkalle
Adjust the values, the command updates live
user@server
ip route get 1.1.1.1

Asks the kernel routing table how a packet to the given address would be sent. The output names the gateway (via), interface (dev) and the source address used (src). Especially useful on servers with multiple IPs, for example to check which address mail or API calls leave the server with.

Note: For IPv6, simply specify an IPv6 address as the destination.

Also searched as

  • which ip does my server use for outgoing traffic
  • ip route get example
  • find outgoing interface for destination

Related one-liners

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Capture network traffic on a port with tcpdump

#tcpdump -i any -nn -c 100 port 25
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Find the public IP address of a server

$curl -4 -s https://icanhazip.com
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Show all IP addresses in a compact overview

$ip -br -c addr
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Show traffic and error counters of a network interface

$ip -s link show eth0
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Test the MTU with ping

$ping -M do -s 1472 -c 3 example.com
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Analyze server errors (5xx) in the access log

#awk '$9 ~ /^5[0-9][0-9]$/ {print $9, $7}' /var/www/vhosts/system/example.com/logs/access_ssl_log | sort | uniq -c | sort -rn | head -20
harmlessLogs

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The commands on myline.de act directly on servers, files and databases. A wrong path or placeholder can delete data irreversibly or make a server unreachable.

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  • Understand what a command does before running it, and check every placeholder.
  • Make a backup first and, if possible, try it on a test system.
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