Commands using route (21)
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8ip route | awk '/default/{print $3}'
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5ip route show dev ppp0 | awk '{ print $7 }'
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Someone might attack on your system. You can drop attacker IP using IPtables. However, you can use route command to null route unwanted traffic. A null route (also called as blackhole route) is a network route or kernel routing table entry that goes nowhere. Matching packets are dropped (ignored) rather than forwarded, acting as a kind of very limited firewall. The act of using null routes is often called blackhole filtering. Show Sample Output
2sudo route add xxx.xxx.xxx.xxx gw 127.0.0.1 lo -
2arp -s $(route -n | awk '/^0.0.0.0/ {print $2}') \ $(arp -n | grep `route -n | awk '/^0.0.0.0/ {print $2}'`| awk '{print $3}')
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ip address show | grep eth0 | sed '1d' | awk '{print $2}'does the same, but shows network-prefix.2ip route show dev eth0 | awk '{print $7}' -
Better use iproute2 !
2ip route list match 0.0.0.0/0 | cut -d " " -f 3 -
2route -n | perl -ne '$ANY="0.0.0.0"; /^$ANY/ and split /\s+/ and print "Gateway to the World: ",($_[1]!=$ANY)?$_[1]:(`ip address show $_[$#_]`=~/peer ([0-9\.]+)/ and $1),", via $_[$#_].\n"'
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Instead of hard-coding in a check to scrape info from ifconfig based on a specific interface, do it in a more portable way. This works really well if you switch between wired, wireless, bluetooth or even VPN connections. You can get your current IP in a script (since it'll be something like tun0 instead of eth0 or wlan1). This uses a well known public ip address 8.8.8.8, but it doesn't actually connect to it, it just shows you the route it would take. Show Sample Output
2ip route get 8.8.8.8 2>/dev/null|grep -Eo 'src [0-9.]+'|grep -Eo '[0-9.]+' -
2route | grep -m1 ^default | awk '{print $NF}'
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This gets you your default route programatically, useful for scripts
1ip route | grep default | awk '{print $3}' -
Useful to determine the source_ip of outgoing packages to a certain destination Show Sample Output
1ip route get dest_ip -
1ip route add default via 192.168.2.1 dev ens33
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Can be used in a firewall script, e.g. to avoid logging broadcast packtes. Show Sample Output
0for net in $(ip route show | cut -f1 -d\ | grep -v default); do ipcalc $net | grep Broadcast | cut -d\ -f 2; done -
0ip route list 0/0
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oder: ip route get $(dig +short google.com | tail -1)
0ip -4 route list 0/0 -
Plenty of commands out there for finding external IP, but sometimes getting the [internal] IP bound to the NIC handling Internet traffic is useful. Probably not production worthy, but a useful quick kludge. Assumes IPv4 and no fancy routing. Show Sample Output
0ifconfig $(route -n |grep -m1 -e ^'0\.0\.\0\.0' |awk '{print $NF}') |grep 'inet addr' |awk '{print $2}' |sed 's/addr://1' -
0ifconfig $(route -n |awk '/0[.]0[.]0[.]0/{print $NF;exit}') | awk '/inet/{print $2}'
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add route default gateway on shell
0route add default gw 192.168.10.1 //OR// ip route add default via 192.168.10.1 dev eth0 //OR// ip route add default via 192.168.10.1 -
Find your default gateway and print it directly output. http://www.bayner.com/ kerim@bayner.com Show Sample Output
-1ip route show | awk '$3 ~ /^[1-9]+/ {print $3;}' -
-1route -n | grep "^0\." | awk '{print "Gateway to the World: "$2", via "$NF""}'
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Find your default gateway and print it directly output http://www.bilgisayarmatematik.com/ kerim@bayner.com Show Sample Output
-2route -n | awk '$2 ~/[1-9]+/ {print $2;}'
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