VPN client cannot receive packets

[Zhi-Qiang Lei]

Hi,

It is my router/firewall with internet connection.

This time I try to list the packets from 8.8.8.8, but there are none.

root at freebsd-7638:~ # tcpdump src 8.8.8.8
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on vtnet0, link-type EN10MB (Ethernet), capture size 65535 bytes

Now the question URL is changed.

http://serverfault.com/questions/631260/freebsd-l2tp-vpn-connection-error

Best regards,
Zhi-Qiang Lei
zhiqiang.lei at gmail.com

On Sep 25, 2014, at 10:20 PM, lokadamus at gmx.de wrote:

> On 25.09.2014 08:48, Zhi-Qiang Lei wrote:
> 
>> I setup a L2TP/IPsec VPN as this article:
>> 
>> http://wiki.stocksy.co.uk/wiki/L2TP_VPN_in_FreeBSD
>> 
>> My problem is that the connected clients cannot receive packets, however, sending is okay.
>> 
>> Here are the tcpdump results if I tried to ping 8.8.8.8:
>> 
>> root at freebsd-7638:~ # tcpdump -i vtnet0 icmp
>> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
>> listening on vtnet0, link-type EN10MB (Ethernet), capture size 65535 bytes
>> 05:55:17.630770 IP 192.168.99.150 > google-public-dns-a.google.com: ICMP echo request, id 36697, seq 0, length 64
>> 05:55:18.627825 IP 192.168.99.150 > google-public-dns-a.google.com: ICMP echo request, id 36697, seq 1, length 64
>> 05:55:19.624058 IP 192.168.99.150 > google-public-dns-a.google.com: ICMP echo request, id 36697, seq 2, length 64
>> 05:55:20.618946 IP 192.168.99.150 > google-public-dns-a.google.com: ICMP echo request, id 36697, seq 3, length 64
>> 05:55:21.622551 IP 192.168.99.150 > google-public-dns-a.google.com: ICMP echo request, id 36697, seq 4, length 64
>> 
>> What could be wrong? And how can I troubleshoot? You may reply on SuperUser if you want, thanks in advance.
>> 
>> http://superuser.com/questions/816485/cannot-receive-packets
>> 
>> Best regards,
>> Zhi-Qiang Lei
>> zhiqiang.lei at gmail.com
>> 
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>> 
> Hi,
> 
> Is this your router/ firewall with internet connection?
> Look with tcpdump for traffic at 8.8.8.8.
> So you can see, if traffic comes back or is missing before your vpn system.
> 
> 
> Best regards
>