openvpn a problem s routovanim (delsi)

[Lukas Kocourek]

Dobry den,

mam 2 pracoviste s gentoo firewally, navzajem propojene openvpn tunelem.

pracoviste A (openvpn jako server) ma lokalni subnet 192.168.2.0/24
pracoviste B (openvpn jako client) ma lokalni subnet 192.168.3.0/24
jako spojovaci subnet mam 172.16.1.0/29

Na obou stranach spustim openvpn, tunel se vytvori a servery se vidi:

server A
------------
tun0      Link encap:UNSPEC  HWaddr 
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
           inet addr:172.16.1.1  P-t-P:172.16.1.2  Mask:255.255.255.255
           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
           RX packets:9 errors:0 dropped:0 overruns:0 frame:0
           TX packets:94 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:100
           RX bytes:756 (756.0 b)  TX bytes:7896 (7.7 Kb)

ping 172.16.1.6
PING 172.16.1.6 (172.16.1.6) 56(84) bytes of data.
64 bytes from 172.16.1.6: icmp_seq=1 ttl=64 time=34.1 ms
64 bytes from 172.16.1.6: icmp_seq=2 ttl=64 time=33.1 ms
64 bytes from 172.16.1.6: icmp_seq=3 ttl=64 time=31.5 ms
64 bytes from 172.16.1.6: icmp_seq=4 ttl=64 time=33.7 ms


server B
------------
tun0      Link encap:UNSPEC  HWaddr 
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
           inet addr:172.16.1.6  P-t-P:172.16.1.5  Mask:255.255.255.255
           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
           RX packets:9 errors:0 dropped:0 overruns:0 frame:0
           TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:100
           RX bytes:756 (756.0 b)  TX bytes:756 (756.0 b)

ping 172.16.1.1
PING 172.16.1.1 (172.16.1.1) 56(84) bytes of data.
64 bytes from 172.16.1.1: icmp_seq=1 ttl=64 time=64.4 ms
64 bytes from 172.16.1.1: icmp_seq=2 ttl=64 time=30.2 ms
64 bytes from 172.16.1.1: icmp_seq=3 ttl=64 time=33.1 ms
64 bytes from 172.16.1.1: icmp_seq=4 ttl=64 time=33.5 ms


vzajemne staticke routy na vdalene site mam nastaveny...
server A
192.168.3.0     172.16.1.2      255.255.255.0   UG    0      0        0 tun0

server B
192.168.2.0     172.16.1.5      255.255.255.0   UG    0      0        0 tun0

kdyz pingnu ze serveru B na stroj v siti A.. napr
ping 192.168.2.11
PING 192.168.2.11 (192.168.2.11) 56(84) bytes of data.
64 bytes from 192.168.2.11: icmp_seq=1 ttl=127 time=51.0 ms
64 bytes from 192.168.2.11: icmp_seq=2 ttl=127 time=31.1 ms
64 bytes from 192.168.2.11: icmp_seq=3 ttl=127 time=33.1 ms

bez problemu to projde, kdyz chci pingnout ze serveru A na stroj v siti 
B.. napr
ping 192.168.3.100
PING 192.168.3.100 (192.168.3.100) 56(84) bytes of data.

--- 192.168.3.100 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 3999ms

packety neprojdou... nechapu proc ?

Zkousel jsem tcpdumpem poslouchat na obou tun0 a zajimave je, ze na 
serveru A jeste ten echo request vidim odchazet, ale na B uz mi 
neprijde. Po nekolikahodinovem laborovani me uz opravdu nenapada v cem 
by to mohlo byt (firewall, ip_forward i rp_filter jsou mimo hru, to jsem 
vse zkousel vypnout/zapnout). Poradi nekdo prosim ?

diky
--
Lukas Kocourek