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<div style="font-size: 13.3333px;">Somebody any idea?</div>
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<span style="font-size: 13.3333px;">PS: In order to get the routing to work I had to add two iptables rules on CLIENT B:</span>
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<div style="font-size: 13.3333px;">-A FORWARD -i eth0 -o tun0 -j ACCEPT</div>
<div style="font-size: 13.3333px;"><font size="1"><span style="font-size: 13.32px;">-A FORWARD -i tun0 -o eth0 -j ACCEPT</span></font></div>
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<div id="divRpF665399" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>Von:</b> TI2015: Kulesza, Dawid<br>
<b>Gesendet:</b> Freitag, 10. August 2018 12:06<br>
<b>An:</b> bird-users@network.cz<br>
<b>Betreff:</b> Strange behavior, cannot reach 4th hop<br>
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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Hello,
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<div>few days ago I struggled with bird configuration over openvpn. It's working now. I can see, that every host has proper routes and with birdc show ospf topology I can see, that every router sees everyone else. I have following setting.</div>
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<div>CLIENT A </div>
<div>192.168.21.1/28</div>
<div>l</div>
<div>l</div>
<div>l</div>
<div>192.168.21.5/28</div>
<div>ROUTER X</div>
<div>192.168.21.25/28</div>
<div>l</div>
<div>l</div>
<div>l</div>
<div>192.168.21.17/28</div>
<div>CLIENT B (with openvpn tunnet to server)</div>
<div>10.29.0.4/22</div>
<div>l</div>
<div>l</div>
<div>l</div>
<div>10.29.0.1/22</div>
<div>SERVER</div>
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<div>The connection from CLIENT B to SERVER is over internet, but it shouldn't matter here.</div>
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<div>Now the issue is as following:</div>
<div>- I can ping from ROUTER X the SERVER </div>
<div>- I can ping from CLIENT A the address (CLIENT B) 10.29.0.4 (and with traceroute I can see, that it's going correctly)</div>
<div>- I cannot ping from CLIENT A the SERVER</div>
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<div>and the same in opposite direction:</div>
<div>- I can ping from SERVER the address 192.168.21.25 (Router X)</div>
<div>- I cannot ping the address 192.168.21.5</div>
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<div>For me it seems like it has something to do with time to live (TTL), because the packets cannot reach 4th hop, but I didn't find anything about it in internet.</div>
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<div>Do you have some ideas what could be wrong? </div>
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<div>Best regards </div>
<div>Dawid</div>
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<div><span style="font-size:10pt">Output from ospf topology on server:</span></div>
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<div>BIRD 1.6.3 ready.</div>
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<div>area 0.0.0.0</div>
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<div> router 10.29.0.1</div>
<div> distance 0</div>
<div> network 10.29.0.0/22 metric 100</div>
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<div> router 192.168.21.1</div>
<div> distance 115</div>
<div> network 192.168.21.0/28 metric 5</div>
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<div> router 192.168.21.5</div>
<div> distance 105</div>
<div> network 192.168.21.16/28 metric 10</div>
<div> network 192.168.21.0/28 metric 10</div>
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<div> router 192.168.21.17</div>
<div> distance 100</div>
<div> network 192.168.21.16/28 metric 5</div>
<div> network 10.29.0.0/22 metric 100</div>
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<div> network 10.29.0.0/22</div>
<div> dr 10.29.0.1</div>
<div> distance 100</div>
<div> router 10.29.0.1</div>
<div> router 192.168.21.17</div>
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<div> network 192.168.21.0/28</div>
<div> dr 192.168.21.5</div>
<div> distance 115</div>
<div> router 192.168.21.5</div>
<div> router 192.168.21.1</div>
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<div> network 192.168.21.16/28</div>
<div> dr 192.168.21.5</div>
<div> distance 105</div>
<div> router 192.168.21.5</div>
<div> router 192.168.21.17</div>
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<div>route -n on server</div>
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<div>2.2.2.2 10.29.0.4 255.255.255.255 UGH 17 0 0 tun0</div>
<div>1.1.1.1 192.168.20.94 255.255.255.255 UGH 17 0 0 eth1</div>
<div>3.3.3.3 10.29.0.4 255.255.255.255 UGH 17 0 0 tun0</div>
<div>192.168.21.16 10.29.0.4 255.255.255.240 UG 17 0 0 tun0</div>
<div>192.168.21.0 10.29.0.4 255.255.255.240 UG 17 0 0 tun0</div>
<div>192.168.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1</div>
<div>10.29.0.0 0.0.0.0 255.255.252.0 U 0 0 0 tun0</div>
<div>XXXXXXXX 0.0.0.0 255.255.0.0 U 1002 0 0 eth1</div>
<div>0.0.0.0 YYYYYYYY 0.0.0.0 UG 0 0 0 eth1</div>
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