cloudstack-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Noel Kendall <noeldkend...@hotmail.com>
Subject RE: Advanced Network - SNAT not working
Date Sun, 15 Sep 2013 13:05:43 GMT
Indeed, yes, a wget executed on the VR to a public website works just fine.
Noel

> Date: Sun, 15 Sep 2013 13:15:20 +0100
> Subject: Re: Advanced Network - SNAT not working
> From: msweet.dev@gmail.com
> To: users@cloudstack.apache.org
> 
> Hi Noel,
> 
> Does the traffic come back on the public interface? and then onto the Guest
> interface?
> 
> Does a wget on the VR work?
> 
> Marty
> 
> 
> On Sat, Sep 14, 2013 at 8:19 PM, Noel Kendall <noeldkendall@hotmail.com>wrote:
> 
> > I have that Marty. I see the http outbound request coming in on the guest
> > interface of the VR,and see the http request being sent out on the public
> > interface of the VR.
> > The traffic is flowing fine from guest to the outbound i/f of the VR.
> > This is tcpdump on the public i/f while guest is doing wget to
> > 6x.xxx.xxx.xxx
> >
> > 19:17:58.834932 06:e3:3a:00:01:0a > 00:0c:86:4e:fe:00, ethertype IPv4
> > (0x0800), length 74: 10.11.79.178.39074 > 6x.xxx.xxx.xx.80: Flags [S], seq
> > 1859313238, win 14600, options [mss 1460,sackOK,TS val 27489348 ecr
> > 0,nop,wscale 4], length 0  0x0000:  4500 003c ad1d 4000 3f06 2d13 0a0b 4fb2
> >        0x0010:  416e c660 98a2 0050 6ed2 de56 0000 0000        0x0020:
> >  a002 3908 516c 0000 0204 05b4 0402 080a        0x0030:  01a3 7444 0000
> > 0000 0103 0304
> >
> >
> > > Date: Sat, 14 Sep 2013 19:29:53 +0100
> > > Subject: Re: Advanced Network - SNAT not working
> > > From: msweet.dev@gmail.com
> > > To: users@cloudstack.apache.org
> > >
> > > Hi Noel,
> > >
> > > Can you run a tcpdump on both VR interfaces, this should make it apparent
> > > what is happening?
> > >
> > > Thanks,
> > > Marty
> > >
> > >
> > > On Sat, Sep 14, 2013 at 6:41 PM, Noel Kendall <noeldkendall@hotmail.com
> > >wrote:
> > >
> > > > http://pastebin.com/3FZmFnvZ
> > > > Many thanks Marty.
> > > > Noel
> > > > > Date: Sat, 14 Sep 2013 18:07:55 +0100
> > > > > Subject: Re: Advanced Network - SNAT not working
> > > > > From: msweet.dev@gmail.com
> > > > > To: users@cloudstack.apache.org
> > > > >
> > > > > Hi Noel,
> > > > >
> > > > > Could you put the IP tables on pastebin? GMail has collapsed the
> > lines
> > > > > horrifically.
> > > > > Have you also tried a tcpdump on both interfaces on the VR?
> > > > > tcpdump -i eth0 <--- Or whatever it may be called
> > > > >
> > > > > I would expect worse connectivity if it was a pure NAT issue, but
I
> > will
> > > > > review the tables later.
> > > > >
> > > > > Thanks,
> > > > > Marty
> > > > >
> > > > >
> > > > > On Sat, Sep 14, 2013 at 5:55 PM, Noel Kendall <
> > noeldkendall@hotmail.com
> > > > >wrote:
> > > > >
> > > > > > Not seeing return packets on VR. Suspect, therefore, that SNAT
is
> > > > fouled
> > > > > > up in some way.I have been doing wget to from guest, can see
the
> > > > outgoing
> > > > > > request fine, both in the guest andthe VR.
> > > > > > Could it be that the SNAT table entries from the 10.11.0.0/16subnet
> > > > to
> > > > > > dpt www are interfering withthe SNAT to public ip?? (wild guess)
-
> > not
> > > > an
> > > > > > iptables expert by any stretch of the imagination
> > > > > > 67.xxx.xxx.56 is the guest public IP10.11.79.178 is the guest
IP on
> > > > guest
> > > > > > network
> > > > > > iptables _L -t nat on the VR shows...
> > > > > > Chain PREROUTING (policy ACCEPT)target     prot opt source
> > > > > > destination         DNAT       tcp  --  anywhere
> > anywhere
> > > > > >      tcp dpt:domain to:10.11.0.1 DNAT       tcp  --  anywhere
> > > > > > 67.xxx.xxx.56        tcp dpt:www to:10.11.79.178:80 DNAT
> > tcp  --
> > > > > >  anywhere             67.xxx.xxx.56        tcp dpt:www
> > > > to:10.11.79.178:80DNAT       tcp  --  anywhere
> > 67.xxx.xxx.56
> > > >        tcp dpt:https
> > > > > > to:10.11.79.178:443 DNAT       tcp  --  anywhere
> > > > > > 67.xxx.xxx.56        tcp dpt:https to:10.11.79.178:443 DNAT
> > tcp
> > > >  --
> > > > > >  anywhere             67.xxx.xxx.56        tcp dpt:ssh
> > > > to:10.11.79.178:22DNAT       tcp  --  anywhere
> > 67.xxx.xxx.56
> > > >        tcp dpt:ssh
> > > > > > to:10.11.79.178:22 DNAT       tcp  --  anywhere
> > > > 67.xxx.xxx.56
> > > > > >        tcp dpt:ftp to:10.11.79.178:21 DNAT       tcp  --  anywhere
> > > > > >       67.xxx.xxx.56        tcp dpt:ftp to:10.11.79.178:21 DNAT
> > > > tcp
> > > > > >  --  anywhere             67.xxx.xxx.56        tcp dpt:5901
to:
> > > > > > 10.11.79.178:5901 DNAT       tcp  --  anywhere
> > > > 67.xxx.xxx.56
> > > > > >        tcp dpt:5901 to:10.11.79.178:5901
> > > > > > Chain POSTROUTING (policy ACCEPT)target     prot opt source
> > > > > > destination         SNAT       all  --  anywhere
> > anywhere
> > > > > >      to:67.xxx.xxx.56  SNAT       all  --  anywhere
> > > > anywhere
> > > > > >          to:67.xxx.xxx.56  SNAT       all  --  anywhere
> > > > > > anywhere            to:67.xxx.xxx.56 SNAT       all  --  anywhere
> > > > > >   anywhere            to:67.xxx.xxx.56 SNAT       all  --  anywhere
> > > > > >     anywhere            to:67.xxx.xxx.56SNAT       all  --
> >  anywhere
> > > > > >       anywhere            to:67.xxx.xxx.56 SNAT       all  --
> >  anywhere
> > > > > >         anywhere            to:67.xxx.xxx.56 SNAT       all
 --
> > > >  anywhere
> > > > > >           anywhere            to:67.xxx.xxx.56 SNAT       tcp
 --
> > > > > > 10.11.0.0/16         myguest             tcp dpt:www to:10.11.0.1
> > SNAT
> > > > > >     tcp  --  10.11.0.0/16         myguest             tcp
> > dpt:https
> > > > > > to:10.11.0.1 SNAT       tcp  --  10.11.0.0/16         myguest
> > > > > > tcp dpt:ssh to:10.11.0.1 SNAT       tcp  --  10.11.0.0/16
> > > > myguest
> > > > > >             tcp dpt:ftp to:10.11.0.1 SNAT       tcp  --
> > 10.11.0.0/16
> > > > > >     myguest             tcp dpt:5901 to:10.11.0.1 SNAT     
 all
> >  --
> > > > > >  anywhere             anywhere            to:67.xxx.xxx.56
> > > > > > Chain OUTPUT (policy ACCEPT)target     prot opt source
> > > > > > destination         DNAT       tcp  --  anywhere
> > > > 67.xxx.xxx.56
> > > > > >       tcp dpt:www to:10.11.79.178:80 DNAT       tcp  --  anywhere
> > > > > >     67.xxx.xxx.56       tcp dpt:https to:10.11.79.178:443 DNAT
> > > > tcp
> > > > > >  --  anywhere             67.xxx.xxx.56       tcp dpt:ssh to:
> > > > > > 10.11.79.178:22 DNAT       tcp  --  anywhere
> > 67.xxx.xxx.56
> > > > > >     tcp dpt:ftp to:10.11.79.178:21 DNAT       tcp  --  anywhere
> > > > > >   67.xxx.xxx.56       tcp dpt:5901 to:10.11.79.178:5901
> > > > > >
> > > > > > > Date: Sat, 14 Sep 2013 17:25:14 +0100
> > > > > > > Subject: Re: Advanced Network - SNAT not working
> > > > > > > From: msweet.dev@gmail.com
> > > > > > > To: users@cloudstack.apache.org
> > > > > > >
> > > > > > > Hi Noel,
> > > > > > >
> > > > > > > Can you try using telnet to connect to an external webserver?
> > telnet
> > > > > > > www.google.com 80
> > > > > > > Can you also clarify: do you see the response packets reach
the
> > VR
> > > > and/or
> > > > > > > on what interfaces?
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Marty
> > > > > > >
> > > > > > > On Saturday, September 14, 2013, Noel Kendall wrote:
> > > > > > >
> > > > > > > > Guest OS cannot receive responses to http GETs from
resources
> > on
> > > > the
> > > > > > > > Internet.
> > > > > > > > Network is advanced, VLAN isolated.
> > > > > > > > What is working:
> > > > > > > > - can browse guest website from internet- can ssh
to guest from
> > > > > > internet-
> > > > > > > > can VPN to guest network from internet
> > > > > > > > - network VR can access internet sites no problem
> > > > > > > > What is not working:
> > > > > > > > - guest http traffic to external website gets to VR
on internal
> > > > NIC,
> > > > > > > > packets forwarded to external site via external NIC
> > > > > > > >
> > > > > > > > Response traffic is not seen. Appears to be dropped.
> > > > > > > > Have been looking hard at IPTABLES rules, doing tcpdumps,
etc.
> > > > > > > > Am at this point stumped.
> > > > > > > > Any ideas on what could be wrong, or how to determine
what
> > could be
> > > > > > wrong?
> > > > > > > > Thanks in advance everyone who tries to help!
> > > > > > > > N.
> > > > > > > >
> > > > > >
> > > > > >
> > > >
> > > >
> >
> >
 		 	   		  
Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message