[Xorp-users] [OSPFv2] BUG: ICMP error message ( Time to Live exceeded )

[karnik]

Operating system : Linux, RHEL4
kernel version: 2.6.9-42.ELsmp
Xorp version:  which is currently on Xorp CVS repository

BUG:  Virtual Adjacency is not getting established between routers 
because ICMP error message ( Time to Live exceeded ) is generated.
Because :  Xorp sets TTL field = 1 seconds in unicast Hello packets 
thats why ICMP message ( Time to Live exceeded ) is getting generated 
while establishing adjacency with adjacent router.

Test scenario References:  [2328] Sections 12.4.1.3 and 16.1 Step 4
Testing Purpose : LSAs with Virtual Links

*Test Setup in brief: *
    All 3 routers are connected in single HUB.
    virtual link is configured  between  Router 1 and Router 2.

Router 1 = having 2 interfaces
Router 1's 1st interface : ip address : 10.100.10.11/24,area = 
0.0.0.0,virtual link with Router 2.
Router 1's 2nd interface : ip address : 10.100.13.11/24,area = 1.1.1.1.

Router 2 = having 2 interfaces
Router 2's 1st interface : ip address : 10.100.10.10/24,area = 0.0.0.0, 
virtual link with Router 1.
Router 2's 2nd interface : ip address : 10.100.11.10/24,area = 1.1.1.1.

Router 3 = having 3 interfaces
Router 2's 1st interface : ip address : 10.100.11.12/24,area = 1.1.1.1 , 
virtual link with Router 1.
Router 2's 2nd interface : ip address : 10.100.12.12/24,area = 1.1.1.1 .
Router 2's 3rd interface : ip address : 10.100.13.12/24,area = 1.1.1.1 .

Test setup in detail :
I have connected 3 xorp routers into One HUB as per configuration file 
that i have attached.

Bug Description:
I have attached above three routers configuration files and ethereal 
dump for this scenario.

In ethereal dump you can see that after all 3 routers are getting 
synchronized  Router 2 and Router 1 starts forming virtual adjacency and 
starts sending unicast hello packets to each other.
But 10.100.11.10  sends unicast hello to 10.100.13.11 at that time ICMP 
error ( Time to Live exceeded )  is not getting generated but while 
10.100.13.11  sends unicast hello to 10.100.11.10 at that time ICMP 
error ( Time to Live exceeded )  is getting generated by 10.100.13.12.

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