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Set Linux from dynamic to static ip temporarily - IPv4

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0

I am trying to change my IP address behind my router to a specific port. I want it dynamic. But having someone try x.y.z.136 first really makes trouble-shooting easier. Even if it is only a 90% guarantee. Otherwise, UDP broadcasting would be a valid/best solution.

#!/bin/bash

network=wlan0

lastdigit=0

newlastdigit=`cat preferred_ip.conf`

ip=`ip -4 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

if [[ ${ip} != *"."* ]]; then

    ip=`ip -6 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

fi



if [[ ${ip} == *"."* ]]

then

    IFS='.' read -r -a ip_array <<< "$ip"

    lastdigit=${ip_array[-1]}

elif [[ ${ip} == *":"* ]]; then

    echo "IPv6 not supported at this time..."

else

    network=eth0

    ip=`ip -4 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`



    if [[ ${ip} != *"."* ]]; then

        ip=`ip -6 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

    fi



    if [[ ${ip} == *"."* ]]; then

       IFS='.' read -r -a ip_array <<< "$ip"

        lastdigit=${ip_array[-1]}

    elif [[ ${ip} == *":"* ]]; then

        echo "IPv6 not supported at this time..."

    else

        echo "Cannot be found"

    fi

fi



echo "ip for ${network} array: ${ip_array[@]} - Last Digit: ${lastdigit} - possible new last dig$



if [ "${lastdigit}" != "${newlastdigit}" ]; then

  newip_array=("${ip_array[@]}")

  newip_array[-1]=$newlastdigit



  IFS=, eval 'newip="${newip_array[*]//,/.}"'

  newip=`echo ${newip} | sed 's/,/./g'`

  isIpOpen=0

  ping -c1 $newip > /dev/null 2>&1 || isIpOpen=1

  if [ ${isIpOpen} == 1 ]; then

    echo "ip ${newip} is free!"

    sudo dhclient -r $network

    sudo ip link set dev $network down

    sudo ip address add $newip dev $network

    sudo ip link set dev $network up

    sudo dhclient $network

  fi

else

  echo "Ip change not required!"

fi

Here is the code I am trying. I don't mind switching to a static ip once I verify the IP address is free (yes, there is a split second something can take the spot between the ping and setting up the static ip...I'm not too worried there).

But everything I find forces you to define every attribute of your network. I simply don't know what network a user will be using. Just that it will be behind a router or within a domain.

How do I switch my ip, keeping all but the last digit I have specified? And on restart, Linux switches to a dynamic IP so my script can be ran again on startup?

Python, Node.JS, and even C/C++ solutions are welcome (not-so-much TCL which I have a hate-hate relationship). But a list of commands or a bash script is just as good.

Since it is a private network, I am only supporting IPv4. (I should
probably remove the IPv6 in my script since IPv4 and IPv6 can run in
parallel).

linux networking

share|improve this question

asked 1 hour ago

TamusJRoyceTamusJRoyce

1012

New contributor

TamusJRoyce is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  what distro. what GUI if any, is networkmanager involved?
  
  – Jasen
  41 mins ago
  

  
  
  
  

add a comment | 

0

I am trying to change my IP address behind my router to a specific port. I want it dynamic. But having someone try x.y.z.136 first really makes trouble-shooting easier. Even if it is only a 90% guarantee. Otherwise, UDP broadcasting would be a valid/best solution.

#!/bin/bash

network=wlan0

lastdigit=0

newlastdigit=`cat preferred_ip.conf`

ip=`ip -4 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

if [[ ${ip} != *"."* ]]; then

    ip=`ip -6 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

fi



if [[ ${ip} == *"."* ]]

then

    IFS='.' read -r -a ip_array <<< "$ip"

    lastdigit=${ip_array[-1]}

elif [[ ${ip} == *":"* ]]; then

    echo "IPv6 not supported at this time..."

else

    network=eth0

    ip=`ip -4 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`



    if [[ ${ip} != *"."* ]]; then

        ip=`ip -6 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

    fi



    if [[ ${ip} == *"."* ]]; then

       IFS='.' read -r -a ip_array <<< "$ip"

        lastdigit=${ip_array[-1]}

    elif [[ ${ip} == *":"* ]]; then

        echo "IPv6 not supported at this time..."

    else

        echo "Cannot be found"

    fi

fi



echo "ip for ${network} array: ${ip_array[@]} - Last Digit: ${lastdigit} - possible new last dig$



if [ "${lastdigit}" != "${newlastdigit}" ]; then

  newip_array=("${ip_array[@]}")

  newip_array[-1]=$newlastdigit



  IFS=, eval 'newip="${newip_array[*]//,/.}"'

  newip=`echo ${newip} | sed 's/,/./g'`

  isIpOpen=0

  ping -c1 $newip > /dev/null 2>&1 || isIpOpen=1

  if [ ${isIpOpen} == 1 ]; then

    echo "ip ${newip} is free!"

    sudo dhclient -r $network

    sudo ip link set dev $network down

    sudo ip address add $newip dev $network

    sudo ip link set dev $network up

    sudo dhclient $network

  fi

else

  echo "Ip change not required!"

fi

Here is the code I am trying. I don't mind switching to a static ip once I verify the IP address is free (yes, there is a split second something can take the spot between the ping and setting up the static ip...I'm not too worried there).

But everything I find forces you to define every attribute of your network. I simply don't know what network a user will be using. Just that it will be behind a router or within a domain.

How do I switch my ip, keeping all but the last digit I have specified? And on restart, Linux switches to a dynamic IP so my script can be ran again on startup?

Python, Node.JS, and even C/C++ solutions are welcome (not-so-much TCL which I have a hate-hate relationship). But a list of commands or a bash script is just as good.

Since it is a private network, I am only supporting IPv4. (I should
probably remove the IPv6 in my script since IPv4 and IPv6 can run in
parallel).

linux networking

share|improve this question

asked 1 hour ago

TamusJRoyceTamusJRoyce

1012

New contributor

TamusJRoyce is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  what distro. what GUI if any, is networkmanager involved?
  
  – Jasen
  41 mins ago
  

  
  
  
  

add a comment | 

I am trying to change my IP address behind my router to a specific port. I want it dynamic. But having someone try x.y.z.136 first really makes trouble-shooting easier. Even if it is only a 90% guarantee. Otherwise, UDP broadcasting would be a valid/best solution.

#!/bin/bash

network=wlan0

lastdigit=0

newlastdigit=`cat preferred_ip.conf`

ip=`ip -4 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

if [[ ${ip} != *"."* ]]; then

    ip=`ip -6 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

fi



if [[ ${ip} == *"."* ]]

then

    IFS='.' read -r -a ip_array <<< "$ip"

    lastdigit=${ip_array[-1]}

elif [[ ${ip} == *":"* ]]; then

    echo "IPv6 not supported at this time..."

else

    network=eth0

    ip=`ip -4 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`



    if [[ ${ip} != *"."* ]]; then

        ip=`ip -6 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

    fi



    if [[ ${ip} == *"."* ]]; then

       IFS='.' read -r -a ip_array <<< "$ip"

        lastdigit=${ip_array[-1]}

    elif [[ ${ip} == *":"* ]]; then

        echo "IPv6 not supported at this time..."

    else

        echo "Cannot be found"

    fi

fi



echo "ip for ${network} array: ${ip_array[@]} - Last Digit: ${lastdigit} - possible new last dig$



if [ "${lastdigit}" != "${newlastdigit}" ]; then

  newip_array=("${ip_array[@]}")

  newip_array[-1]=$newlastdigit



  IFS=, eval 'newip="${newip_array[*]//,/.}"'

  newip=`echo ${newip} | sed 's/,/./g'`

  isIpOpen=0

  ping -c1 $newip > /dev/null 2>&1 || isIpOpen=1

  if [ ${isIpOpen} == 1 ]; then

    echo "ip ${newip} is free!"

    sudo dhclient -r $network

    sudo ip link set dev $network down

    sudo ip address add $newip dev $network

    sudo ip link set dev $network up

    sudo dhclient $network

  fi

else

  echo "Ip change not required!"

fi

Here is the code I am trying. I don't mind switching to a static ip once I verify the IP address is free (yes, there is a split second something can take the spot between the ping and setting up the static ip...I'm not too worried there).

But everything I find forces you to define every attribute of your network. I simply don't know what network a user will be using. Just that it will be behind a router or within a domain.

How do I switch my ip, keeping all but the last digit I have specified? And on restart, Linux switches to a dynamic IP so my script can be ran again on startup?

Python, Node.JS, and even C/C++ solutions are welcome (not-so-much TCL which I have a hate-hate relationship). But a list of commands or a bash script is just as good.

Since it is a private network, I am only supporting IPv4. (I should
probably remove the IPv6 in my script since IPv4 and IPv6 can run in
parallel).

linux networking

share|improve this question

asked 1 hour ago

TamusJRoyceTamusJRoyce

1012

New contributor

TamusJRoyce is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

#!/bin/bash

network=wlan0

lastdigit=0

newlastdigit=`cat preferred_ip.conf`

ip=`ip -4 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

if [[ ${ip} != *"."* ]]; then

    ip=`ip -6 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

fi



if [[ ${ip} == *"."* ]]

then

    IFS='.' read -r -a ip_array <<< "$ip"

    lastdigit=${ip_array[-1]}

elif [[ ${ip} == *":"* ]]; then

    echo "IPv6 not supported at this time..."

else

    network=eth0

    ip=`ip -4 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`



    if [[ ${ip} != *"."* ]]; then

        ip=`ip -6 addr show ${network} | grep inet | awk '{print $2}' | cut -d/ -f1`

    fi



    if [[ ${ip} == *"."* ]]; then

       IFS='.' read -r -a ip_array <<< "$ip"

        lastdigit=${ip_array[-1]}

    elif [[ ${ip} == *":"* ]]; then

        echo "IPv6 not supported at this time..."

    else

        echo "Cannot be found"

    fi

fi



echo "ip for ${network} array: ${ip_array[@]} - Last Digit: ${lastdigit} - possible new last dig$



if [ "${lastdigit}" != "${newlastdigit}" ]; then

  newip_array=("${ip_array[@]}")

  newip_array[-1]=$newlastdigit



  IFS=, eval 'newip="${newip_array[*]//,/.}"'

  newip=`echo ${newip} | sed 's/,/./g'`

  isIpOpen=0

  ping -c1 $newip > /dev/null 2>&1 || isIpOpen=1

  if [ ${isIpOpen} == 1 ]; then

    echo "ip ${newip} is free!"

    sudo dhclient -r $network

    sudo ip link set dev $network down

    sudo ip address add $newip dev $network

    sudo ip link set dev $network up

    sudo dhclient $network

  fi

else

  echo "Ip change not required!"

fi

share|improve this question

asked 1 hour ago

TamusJRoyceTamusJRoyce

1012

New contributor

TamusJRoyce is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 1 hour ago

TamusJRoyceTamusJRoyce

1012

New contributor

TamusJRoyce is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 1 hour ago

TamusJRoyceTamusJRoyce

1012

New contributor

TamusJRoyce is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 1 hour ago

TamusJRoyceTamusJRoyce

1012