how can I split traffic on OSX so that only some certain subnet are routed to ethernet interface and the rest is routed to Wifi?
I've been using this script for more that 1 and a half year but today it stopped working. All it does is it deletes the default gateway and sets the desired one (i.e. en2 = wifi) as default and it adds record for each subnet telling it to route it through desired "tunnel" interface (i.e. en0 = ethernet).
#! /usr/bin/env zsh
if (( EUID != 0 )); then
echo "Please, run this command with sudo" >&2
exit 1
fi
if [ "$#" -ne "2" ]; then
echo "Usage: $0 tunnel_interface default_interface" >&2
exit 1
fi
TUNNEL_INTERFACE=$1
DEFAULT_INTERFACE=$2
GATEWAY=$(netstat -nrf inet | grep default | grep $DEFAULT_INTERFACE | awk '{print $2}')
if [ "$GATEWAY" = "" ]; then
read "GATEWAY?Enter gateway IP address: "
fi
echo "Resetting routes with gateway => $GATEWAY"
echo
route -n delete default -ifscope $DEFAULT_INTERFACE 1>/dev/null
route -n delete -net default -interface $TUNNEL_INTERFACE 1>/dev/null
route -n add -net default $GATEWAY 1>/dev/null
for subnet in 10.89 10.153 10.162 10.168 172.24.0.0/13
do
route -n add -net $subnet -interface $TUNNEL_INTERFACE 1>/dev/null 2>&1
done
echo "google.cz -> $(route get google.cz | grep interface | sed 's/^ *//')"
echo "r5d00 -> $(route get r5d00 | grep interface | sed 's/^ *//')"
I run this script like this
$ sudo tunnel-ips.sh no en0 en2
Password:
Resetting routes with gateway => 172.20.10.1
google.cz -> interface: en2
r5d00 -> interface: en0
I'm connected via Wifi to my iPhone Personal hotspot, it assigns me IP 172.20.10.4 and mask 255.255.255.240. The r5d00 server has IP set to 172.24.146.155, which matches with 172.24.0.0/13.
My routing table looks like this: $ netstat -rn Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 172.20.10.1 UGSc 3 0 en2
10.89/16 link#4 UCSc 1 0 en0
10.153/16 link#4 UCSc 1 0 en0
10.162/21 link#4 UCS 6 0 en0
10.162/16 link#4 UCSc 1 0 en0
10.162.0.1/32 link#4 UCS 2 0 en0
10.162.0.1 0:0:c:9f:f0:1 UHLWIi 2 4 en0 1167
10.162.0.241 0:20:4a:e6:5c:2c UHLWIi 1 0 en0 1149
10.162.0.242 0:20:4a:54:87:a0 UHLWIi 1 0 en0 1079
10.162.0.243 0:20:4a:d7:d8:3e UHLWIi 1 0 en0 1132
10.162.1.22 0:1e:b:ed:21:b8 UHLWIi 1 18 en0 1136
10.162.7.241/32 link#4 UCS 1 0 en0
10.167/16 link#4 UCSc 1 0 en0
10.168/16 link#4 UCSc 1 0 en0
10.255/16 link#4 UCSc 1 0 en0
127 127.0.0.1 UCS 1 0 lo0
127.0.0.1 127.0.0.1 UH 5 2329 lo0
169.254 link#4 UCS 1 0 en0
169.254 link#5 UCSI 1 0 en2
172.20.10/28 link#5 UCS 1 0 en2
172.20.10.1/32 link#5 UCS 2 0 en2
172.20.10.1 36:e2:fd:74:7b:64 UHLWIir 5 11 en2 1067
172.20.10.4/32 link#5 UCS 1 0 en2
172.24/13 link#4 UCSc 7 0 en0
255.255.255.255/32 link#4 UCS 1 0 en0
255.255.255.255/32 link#5 UCSI 1 0 en2
Internet6:
Destination Gateway Flags Netif Expire
::1 ::1 UHL lo0
fe80::%lo0/64 fe80::1%lo0 UcI lo0
fe80::1%lo0 link#1 UHLI lo0
fe80::%awdl0/64 link#7 UCI awdl0
fe80::a4a8:81ff:fe02:a44d%awdl0 a6:a8:81:2:a4:4d UHLI lo0
fe80::%utun0/64 fe80::db39:e7b8:6234:7841%utun0 UcI utun0
fe80::db39:e7b8:6234:7841%utun0 link#9 UHLI lo0
ff01::%lo0/32 ::1 UmCI lo0
ff01::%awdl0/32 link#7 UmCI awdl0
ff01::%utun0/32 fe80::db39:e7b8:6234:7841%utun0 UmCI utun0
ff02::%lo0/32 ::1 UmCI lo0
ff02::%awdl0/32 link#7 UmCI awdl0
ff02::%utun0/32 fe80::db39:e7b8:6234:7841%utun0 UmCI utun0
When I ping r5d00, it says "No route to host"
$ ping r5d00
PING r5d00.cezdata.corp (172.24.146.155): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
ping: sendto: No route to host
Request timeout for icmp_seq 4
ping: sendto: Host is down
Request timeout for icmp_seq 5
ping: sendto: Host is down
Request timeout for icmp_seq 6
ping: sendto: Host is down
Request timeout for icmp_seq 7
ping: sendto: Host is down
Request timeout for icmp_seq 8
ping: sendto: Host is down
Request timeout for icmp_seq 9
ping: sendto: Host is down
Request timeout for icmp_seq 10
I downloaded Wireshark and I recorded the traffic but the ICMP packets are nowhere to find (when I disable Wifi and reset routing table, it does get recorded and ping is successfull). It seems like the IP isn't matched with the routing table record, but when I check it via route get, it says it's routed through en0 (which is correct).
$ route get r5d00
route to: r5d00
destination: r5d00
interface: en0
flags: <UP,HOST,REJECT,DONE,LLINFO,WASCLONED,IFSCOPE,IFREF>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire
0 0 0 0 0 0 1500 -138
Like I said, it was working yesterday, but today it's not. I didn't download any update or anything. AFAIK it's problem on my Mac, not on the internal network, since nobody else has a problem.
