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Re: LVS-TUN setup - responses from realserver not being let through

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: LVS-TUN setup - responses from realserver not being let through
From: Per Jessen <per@xxxxxxxxxxxx>
Date: Fri, 15 Sep 2006 11:20:29 +0200
Roberto Nibali wrote:

>>> Using tcpdump:
>>>
>>> 1. I see the request arriving on the real server over the tunnel
>>> link. 2. On the real server I see the response being sent.
> 
> Do you by any chance see the response passing by the director?

No, on the director I only see the request. 

>> I'm not sure exactly what this is indicative of, but:
>> 
>> On the real server -
>> 
>> "traceroute -S <VIP> <client>" - nothing comes through.  Does this
>> mean there's a router config problem, i.e. a router is not letting
>> those packets through due to the source address?
> 
> What's your routing entries? ip rule show, ip route show? What does an
> ip route get <client> from <VIP> show you?

On the director:  (presumably not interesting)

# ip route get 217.8.220.94 from 88.198.198.122
217.8.220.94 from 88.198.198.122 via 88.198.41.97 dev eth1
    cache  mtu 1500 advmss 1460 fragtimeout 64

On the real server:

# ip route get 217.8.220.94 from 88.198.198.122
217.8.220.94 from 88.198.198.122 via 88.198.7.129 dev eth1
    cache  mtu 1500 advmss 1460 fragtimeout 64

# ip rule show
0:      from all lookup local
32766:  from all lookup main
32767:  from all lookup default

# ip route show
88.198.7.128/27 dev eth1  proto kernel  scope link  src 88.198.7.133
169.254.0.0/16 dev eth1  scope link
127.0.0.0/8 dev lo  scope link
default via 88.198.7.129 dev eth1


> Where about in Zürich are you?

We're in Herrliberg, about 25mins south on the Goldcoast.

> Cheers,
> Roberto Nibali, ratz (in Altstetten right now)

Ah, I suspect I know who you are working for :-)



/Per Jessen, Zürich


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