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Old 05-02-2007, 06:00 AM   #1
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Registered: May 2007
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ping: sendmsg: Operation not permitted

Hi everyone,

I am trying to set up a VPN between two branches. Branch A is on subnet and branch B is on subnet
I am using Juniper IPSEC VPN concentrators on both sides. I have no control over the VPN terminator in branch B, have only been given the parameters.

A test machine in branch B with IP has been set up with a static route pointing to the VPN terminator on branch B LAN.

I have set up a test machine on branch A lan with ip address and a static route directing all traffic destined for to the internal interface of the VPN terminator,

Now here is where it gets a bit sticky.

Branch A is located in another country so I am logged in via SSH to a second interface on the test machine. This interface is on a public ip.

here is ifconfig:

eth0 Link encap:Ethernet HWaddr 00:02:44:9C:63:1B
inet addr: Bcast: Mask:
inet6 addr: fe80::202:44ff:fe9c:631b/64 Scope:Link
RX packets:24327733 errors:0 dropped:0 overruns:0 frame:0
TX packets:19821600 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3429279278 (3270.4 Mb) TX bytes:4132813808 (3941.3 Mb)
Interrupt:193 Base address:0x4400

eth1 Link encap:Ethernet HWaddr 00:0E:7F:B0:07:54
inet addr:207.x.x.x Bcast:207.x.x.x Mask:
inet6 addr: fe80::20e:7fff:feb0:754/64 Scope:Link
RX packets:14669413 errors:1 dropped:0 overruns:0 frame:0
TX packets:13243137 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3131123896 (2986.0 Mb) TX bytes:2699259384 (2574.2 Mb)

lo Link encap:Local Loopback
inet addr: Mask:
inet6 addr: ::1/128 Scope:Host
RX packets:42630 errors:0 dropped:0 overruns:0 frame:0
TX packets:42630 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3386915 (3.2 Mb) TX bytes:3386915 (3.2 Mb)

and here is route -n

Destination Gateway Genmask Flags Metric Ref Use Iface
207.x.x.x U 0 0 0 eth1 U 0 0 0 eth0 U 0 0 0 eth1 UG 0 0 0 eth0 U 0 0 0 lo 207.x.x.x UG 0 0 0 eth1

I can see the internal interface of the VPN terminator:

PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=64 time=3.71 ms

But when I try to ping the test machine at branch B, I get this error:

From icmp_seq=7 Destination Host Unreachable
ping: sendmsg: Operation not permitted

My IP Tables allow ICMP originating from this host because I can ping to the private and public network. Now the question is;
Is this ping error a result of incorrect route configuration, iow, originating from my test machine, or is it because of VPN mis configuration, iow originating from the VPN terminator?




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