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Old 10-07-2003, 10:58 AM   #1
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Registered: Oct 2003
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Post VPN with IPSec question

I really stuck here (help me please ):

I'm trying to set a IPSec based VPN tunnel up.
Everything works till the point where data should be transmitted, so I get "IPsec SA established" on both linux boxes.

If I try to ping the destination host (any of them) I get 100% packet lost.

The ifconfig -i ipsec0 output looks like:
ipsec0 Link encap:IPIP Tunnel HWaddr
inet addr: Mask:
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:4 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

The tcpdump on ipsec0 says:
16:56:43.686674 unknown ip 0
16:56:44.700074 unknown ip 0
16:56:45.700077 unknown ip 0
16:56:46.700063 unknown ip 0
16:56:47.710419 unknown ip 0

So all the packets get dropped by the ipsec interface. Any ideas?

Thanx in advance,

Old 10-08-2003, 06:13 PM   #2
Registered: Jul 2003
Distribution: Currently Suse 11.1 but have RH7,8,9 / Fedora 7,8_64,9_64,&10_64
Posts: 634

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local boxes or over the internet?

over the internet RFC 1918 drops the private addresses

on a LAN
you have something else wrong
Old 10-09-2003, 02:52 AM   #3
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Registered: Oct 2003
Posts: 2

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Well the external interfaces of the boxes use real IP-Addresses.
They are actually even in the same subnet just couple of meters away...

But I actually thought VPN can be used to connect two private networks, why is it dropping the packets than?

Thnx anyway :-)


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