From 03f4dac09720daf946086e8d4941d8a7a734337f Mon Sep 17 00:00:00 2001 From: Molly Lau Date: Thu, 18 May 2023 18:15:07 +0900 Subject: [PATCH] Update InstallNET.sh --- Linux_reinstall/InstallNET.sh | 54 +++++++++++++++++++++++++++++++++-- 1 file changed, 51 insertions(+), 3 deletions(-) diff --git a/Linux_reinstall/InstallNET.sh b/Linux_reinstall/InstallNET.sh index ab37c4a..a07ebb1 100644 --- a/Linux_reinstall/InstallNET.sh +++ b/Linux_reinstall/InstallNET.sh @@ -402,6 +402,7 @@ function netmask() { echo "$m" } +# $1 is IPv4 address, $2 is IPv4 subnet. function ipv4Calc() { tmpIp4="$1" tmpIp4Mask=`netmask "$2"` @@ -1482,7 +1483,8 @@ if [[ "$setNet" == "0" ]]; then [[ -n "$interface" ]] || interface=`getInterface "$CurrentOS"` iAddr=`ip -4 addr show | grep -wA 5 "$interface" | grep -wv "lo\|host" | grep -w "inet" | grep -w "scope global*\|link*" | head -n 1 | awk -F " " '{for (i=2;i<=NF;i++)printf("%s ", $i);print ""}' | awk '{print$1}'` ipAddr=`echo ${iAddr} | cut -d'/' -f1` - ipMask=`netmask $(echo ${iAddr} | cut -d'/' -f2)` + ipPrefix=`echo ${iAddr} | cut -d'/' -f2` + ipMask=`netmask "$ipPrefix"` # In most situation, at least 99.9% probability, the first hop of the network should be the same as the available gateway. # But in 0.1%, they are actually different. # Because one of the first hop of a tested machine is 5.45.72.1, I told Debian installer this router as a gateway @@ -1527,16 +1529,62 @@ if [[ "$setNet" == "0" ]]; then done # If there is no one of other gateway in this current network, use if access the public internet, the first hop route of this machine as the gateway. [[ "$ipGates" == "" || "$ipGate" == "" ]] && ipGate="$FirstRoute" + +# Some cloud providers like godaddy, arkecx etc, the subnet mask of IPv4 static network configuration of their original template OS is incorrect. +# The following is the sample: +# auto eth0 +# iface eth0 inet static +# address 192.169.119.26 +# gateway 156.59.39.113 +# netmask 255.255.255.240 +# dns-nameservers 8.8.8.8 8.8.4.4 +# +# The netmask tells the total number of IP in the network is only 15(255 - 240), +# but we obsessed that there are more than 15 IP between 156.59.39.113 and 192.169.119.26 clearly. +# So if netmask is 255.255.255.240(prefix is 28), the computer only find IP between 192.169.119.192 and 192.169.119.207, +# the gateway 156.59.39.113 is obviously not be included in this range. +# So we need to expand the range of the netmask(reduce the of the prefix) to make sure the IP of gateway have been contained. +# If this mistake has not be repaired, Debian installer will return error "untouchable gateway". +# DHCP IPv4 network doesn't be effected by this situation. + [[ "$Network4Config" == "isStatic" ]] && { +# If the IP and gateway are not in the same IPv4 A class, the prefix of netmask should be "1", transfer to whole IPv4 address is 128.0.0.1 +# The range of 192.169.119.26/1 is 128.0.0.0 - 255.255.255.255, the gateway 156.59.39.113 can be included. + [[ `echo $ipAddr | cut -d'.' -f 1` != `echo $ipGate | cut -d'.' -f 1` ]] && ipMask=`netmask "1"` +# If the IP and gateway are in the same IPv4 A class, not in the same IPv4 B class, the prefix of netmask should less than "8", transfer to whole IPv4 address is 255.0.0.0 +# The range of 192.169.119.26/8 is 192.0.0.0 - 192.255.255.255, the gateway can be included. + if [[ `echo $ipAddr | cut -d'.' -f 1` == `echo $ipGate | cut -d'.' -f 1` ]] && [[ "$ipPrefix" -gt "8" ]]; then + ipMask=`netmask "8"` + fi +# If the IP and gateway are in the same IPv4 A B class, not in the same IPv4 C class, the prefix of netmask should less than "16", transfer to whole IPv4 address is 255.255.0.0 +# The range of 192.169.119.26/16 is 192.169.0.0 - 192.169.255.255, the gateway can be included. + if [[ `echo $ipAddr | cut -d'.' -f 1,2` == `echo $ipGate | cut -d'.' -f 1,2` ]] && [[ "$ipPrefix" -gt "16" ]]; then + ipMask=`netmask "16"` + fi +# If the IP and gateway are in the same IPv4 A B C class, not in the same IPv4 D class, the prefix of netmask should less than "24", transfer to whole IPv4 address is 255.255.255.0 +# The range of 192.169.119.26/24 is 192.169.119.0 - 192.169.119.255, the gateway can be included. + if [[ `echo $ipAddr | cut -d'.' -f 1,2,3` == `echo $ipGate | cut -d'.' -f 1,2,3` ]] && [[ "$ipPrefix" -gt "24" ]]; then + ipMask=`netmask "24"` + fi + } [[ "$IPStackType" != "IPv4Stack" ]] && { i6Addr=`ip -6 addr show | grep -wA 5 "$interface" | grep -wv "lo\|host" | grep -wv "link" | grep -w "inet6" | grep "scope" | grep "global" | head -n 1 | awk -F " " '{for (i=2;i<=NF;i++)printf("%s ", $i);print ""}' | awk '{print$1}'` ip6Addr=`echo ${i6Addr} |cut -d'/' -f1` ip6Mask=`echo ${i6Addr} |cut -d'/' -f2` -# If mask of IPv6 is 128 in static configuration, it means there is only one IP(current server itself) in the network. -# In this condition, if IPv6 gateway has a different address with IPv6 address, the installer couldn't find the correct gateway. +# In some original template OS of akile.io etc, if mask prefix of IPv6 is 128 in static network configuration, it means there is only one IP(current server itself) in the network. +# The following is the sample: +# auto eth0 +# iface eth0 inet6 static +# address 2001:b030:a42d:5d00::ffff:4e9a +# gateway 2001:b030:a42d:5d00::ffff +# netmask 128 +# dns-nameservers 2001:4860:4860::8888 +# +# In this condition, if IPv6 gateway has a different address with IPv6 address, the Debian installer couldn't find the correct gateway. # The installation will fail in the end. The reason is mostly the upstream wrongly configurated the current network of this system. # So we try to revise this value from "128" to "64" to expand the range of the IPv6 network and help installer to find the correct gateway. # DHCP IPv6 network doesn't be effected by this situation. +# The result of function ' ipv6SubnetCalc "$ip6Mask" ' is "$ip6Subnet" [[ "$Network6Config" == "isStatic" && "$ip6Mask" -ge "96" ]] && ip6Mask="64" ipv6SubnetCalc "$ip6Mask" ip6Gate=`ip -6 route show default | grep -w "$interface" | grep -w "via" | grep "dev" | head -n 1 | awk -F " " '{for (i=3;i<=NF;i++)printf("%s ", $i);print ""}' | awk '{print$1}'`