check information

[!NOTE|label:references:]

$ scutil --nwi
Network information

IPv4 network interface information
     en8 : flags      : 0x5 (IPv4,DNS)
           address    : 10.1.1.1
           reach      : 0x00000002 (Reachable)
     en0 : flags      : 0x5 (IPv4,DNS)
           address    : 192.168.6.55
           reach      : 0x00000002 (Reachable)

   REACH : flags 0x00000002 (Reachable)

IPv6 network interface information
   No IPv6 states found


   REACH : flags 0x00000000 (Not Reachable)

Network interfaces: en8 en0

get interface

# default route
$ ip route get $(dig +short github.com | head -1) | sed -rn 's|.*dev\s+(\S+)\s+src.*$|\1|p')
# or
$ ip route get $(nslookup "${githubIp}" | grep Server | awk -F' ' '{print $NF}') | sed -rn 's|.*dev\s+(\S+)\s+src.*$|\1|p'
en8

# all active interface
$ netstat -nr | grep -E 'UG|UGSc' | grep -E '^0.0.0|default' | grep -E '[0-9.]{7,15}' | awk -F' ' '{print $NF}'
en0
en8
  • list all interfaces

    $ /sbin/ifconfig | grep --color=none flags=8863 | grep -v bridge
    en5: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    llw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    en8: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    
    # or
    $ scutil --nwi | awk -F': ' '/Network interfaces/ {print $2;exit;}'
    en8 en0
    

get ip address

$ ipAddr=$(/usr/local/bin/ip a s "${interface}" | sed -rn 's|\W*inet[^6]\W*([0-9\.]{7,15}).*$|\1|p')
# or via `/sbin/ifconfig`
$ ipAddr=$(/sbin/ifconfig "${interface}" | sed -rn 's|^\s+inet\s+([0-9\.]+))

get mac address

$ ip link show ${interface} | sed -rn 's|.*ether ([0-9a-fA-F:]{17}).*$|\1|p' | sed 's|:||g' | tr [a-z] [A-Z]

get interface information

#!/bin/bash

while read -r line; do
    sname=$(echo "$line" | awk -F  "(, )|(: )|[)]" '{print $2}')
    sdev=$(echo "$line" | awk -F  "(, )|(: )|[)]" '{print $4}')
    # echo "Current service: $sname, $sdev, $currentservice"
    if [ -n "$sdev" ]; then
        ifout="$(/sbin/ifconfig "$sdev" 2>/dev/null)"
        echo "$ifout" | grep 'status: active' > /dev/null 2>&1
        rc="$?"
        if [ "$rc" -eq 0 ]; then
            currentservice="$sname"
            currentdevice="$sdev"
            currentip=$(echo "${ifout}" | sed -rn 's|^\s+inet\s+([0-9\.]+).*$|\1|p')
            currentmac=$(echo "$ifout" | awk '/ether/{print $2}')
            # may have multiple active devices, so echo it here
            echo "$currentservice, $currentdevice, $currentmac, ${currentip}"
        fi
    fi
done <<< "$(networksetup -listnetworkserviceorder | grep --color=none 'Hardware Port')"

route

[!NOTE|label:references:]

  • route flags
FLAG DESCRIPTION
U Up—Route is valid
G Gateway—Route is to a gateway router
H Host name—Route is to a host rather than to a network
R Reject—Set by ARP when an entry expires
D Dynamic—Route added by a route redirect or RIP
M Modified—Route modified by a route redirect
C Cloning—A new route is cloned from this entry when it is used
L Link—Link-level information, such as the Ethernet MAC address, is present
S Static—Route added with the route command

check route

  • show all

    # linux-like route -n
    $ netstat -nr
    # or
    $ netstat -nr -f inet
    
    # via `ip route`
    $ ip route show
    
  • show particular ip

    $ route get <ip.address>
       route to: ec2-1-1-1-1.compute-1.amazonaws.com
    destination: ec2-1-1-1-1.compute-1.amazonaws.com
        gateway: 192.168.0.1
      interface: en0
          flags: <UP,GATEWAY,HOST,DONE,STATIC>
     recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire
           0         0         0        77        11         0      1500         0
    
    # or via `ip route`
    $ ip route get 1.1.1.1
    1.1.1.1 via 192.168.0.1 dev en0  src 192.168.6.55
    
  • display network interface status

    $ netstat -i
    
  • log network problems

    $ /usr/sbin/in.routed /var/logfilename
    

add a static route item

$ sudo route -nv add -host <ip.address> <gateway>

# or
$ sudo route add -host <ip.address> -iface en1

delete a static route

$ sudo route delete <ip.address> <gateway>

vpn

[!NOTE|label:references:]

Copyright © marslo 2020-2023 all right reserved,powered by GitbookLast Modified: 2024-03-12 15:01:28

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