Hi,
I have a 2.3.6 server with dev tun and default topology (net30?). Server is
configured as "server 192.168.13.0 255.255.255.0". I have noticed a weird
routing on osx where the traffic
for a local peer ip gets routed to the server and back:
osx # /sbin/ifconfig utun1
utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
inet 192.168.13.237 --> 192.168.13.238 netmask 0xffffffff nd6
options=201<PERFORMNUD,DAD>
osx # traceroute -n 192.168.13.237
traceroute to 192.168.13.237 (192.168.13.237), 64 hops max, 52 byte packets
1 192.168.13.1 38.295 ms 37.184 ms 37.794 ms
2 192.168.13.237 74.515 ms 71.977 ms 70.691 ms
osx # netstat -rn | grep ^192.168.13
192.168.13 utun1 USc 1 4 utun1
192.168.13.1/32 192.168.13.238 UGSc 0 0 utun1
192.168.13.237 utun1 UHS 1 0 utun1
I have tried with openvpn from homebrew, viscosity and tunnelblick
and they all behave the same. No matter what I do as soon as there is a
route on the utun interface for the peer ip the traffic gets routed to
the server internal IP no matter what. Linux client with the same config is
behaving correctly and goes straight to the peer ip:
lnx # ip a s tun0
6: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc
pfifo_fast state UNKNOWN qlen 100
link/none inet 192.168.13.33 peer 192.168.13.34/32 scope global tun0
valid_lft forever preferred_lft forever
lnx # ip r s | grep ^192.168.13
192.168.13.0/24 via 192.168.13.34 dev tun0 192.168.13.1 via 192.168.13.34 dev
tun0 192.168.13.34 dev tun0 proto kernel scope link src 192.168.13.33 lnx #
traceroute -n 192.168.13.33
traceroute to 192.168.13.33 (192.168.13.33), 30 hops max, 60 byte packets
1 192.168.13.33 0.066 ms 0.014 ms 0.012 ms
any ideas why is that happening and how can I prevent it, i.e. replicate the
linux behaviour?
Thanks,
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