Network configuration problem with NAT and OpenVZ

R

romaint

Member
May 4, 2013
6
0
21
Hi !

I have a server with Proxmox. I have an OpenVZ configuration with many VE with NAT.
But I have a problem with my network configuration !

We have an Apache on a VE (prod-web-1) and I can't get access to a domain (tutu.fr for example) hosted on this VE (using the public IP A.B.C.D) from this VE :
Code: 
root@prod-web-1:~# telnet tutu.fr 80
Trying A.B.C.D...

It's ok when we use localhost or private ip of the VE (192.168.0.101) :
Code: 
root@prod-web-1:~# telnet localhost 80
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

Code: 
root@prod-web-1:~# telnet 192.168.0.101 80
Trying 192.168.0.101...
Connected to 192.168.0.101.
Escape character is '^]'.


It works from the node (tanenbaum) :
Code: 
root@tanenbaum:~# telnet tutu.fr 80
Trying A.B.C.D...
Connected to tutu.fr.
Escape character is '^]'.

and from others VE (prod-bdd-1 for example) :
Code: 
root@prod-bdd-1:~# telnet tutu.fr 80
Trying A.B.C.D...
Connected to tutu.fr.
Escape character is '^]'.

My configuration :

NAT :
Code: 
root@tanenbaum:~# iptables -L -v -t nat
Chain PREROUTING (policy ACCEPT 69 packets, 4311 bytes)
 pkts bytes target     prot opt in     out     source               destination
   86  4584 DNAT       tcp  --  any    any     anywhere             srv1.toto.fr       tcp dpt:http to:192.168.0.101:80
    0     0 DNAT       tcp  --  eth0   any     anywhere             srv1.toto.fr       tcp dpt:ftp to:192.168.0.101:21
    0     0 DNAT       tcp  --  eth0   any     anywhere             srv1.toto.fr       tcp dpts:4242:4300 to:192.168.0.101

Chain POSTROUTING (policy ACCEPT 247 packets, 27946 bytes)
 pkts bytes target     prot opt in     out     source               destination
   13   819 SNAT       all  --  any    any     192.168.0.0/24      !192.168.0.0/24       to:A.B.C.D

Chain OUTPUT (policy ACCEPT 117 packets, 20722 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DNAT       tcp  --  any    any     anywhere             srv1.toto.fr       tcp dpt:http to:192.168.0.101:80
    0     0 DNAT       tcp  --  any    any     anywhere             srv1.toto.fr       tcp dpt:ftp to:192.168.0.101:21
    0     0 DNAT       tcp  --  any    any     anywhere             srv1.toto.fr       tcp dpts:4242:4300 to:192.168.0.101

Filter :
Code: 
root@tanenbaum:~# iptables -L -v
Chain INPUT (policy DROP 3 packets, 152 bytes)
 pkts bytes target     prot opt in     out     source               destination
   44  3710 ACCEPT     all  --  lo     any     anywhere             anywhere
  437 34317 ACCEPT     all  --  any    any     anywhere             anywhere             state RELATED,ESTABLISHED
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere             tcp dpt:https state NEW
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere             tcp dpt:6984 state NEW
    0     0 ACCEPT     tcp  --  eth0   any     cache.ovh.net        anywhere             tcp dpt:ssh
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere             tcp dpt:8006 state NEW
   12   952 ACCEPT     icmp --  any    any     anywhere             anywhere
    0     0 ACCEPT     tcp  --  any    any     torvalds.toto.fr   anywhere             tcp dpt:mysql state NEW
    0     0 ACCEPT     all  --  any    any     192.168.0.0/24       anywhere

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
15265 9481K ACCEPT     all  --  any    any     192.168.0.0/24       anywhere
 1714  568K ACCEPT     all  --  any    any     anywhere             192.168.0.0/24

Chain OUTPUT (policy ACCEPT 156 packets, 26429 bytes)
 pkts bytes target     prot opt in     out     source               destination
   44  3710 ACCEPT     all  --  any    lo      anywhere             anywhere
  415  156K ACCEPT     all  --  any    any     anywhere             anywhere             state RELATED,ESTABLISHED


Ip forwarding is enabled :
Code: 
root@tanenbaum:~# cat /proc/sys/net/ipv4/ip_forward
1

Network configuration :
Code: 
root@tanenbaum:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address E.F.G.H
        netmask 255.255.255.0
        network E.F.G.0
        broadcast E.F.G.255
        gateway E.F.G.254
        # IP Failover
        post-up /sbin/ifconfig eth0:0 A.B.C.D netmask 255.255.255.255 broadcast A.B.C.D
        post-down /sbin/ifconfig eth0:0 down
        post-up /sbin/ifconfig eth0:1 192.168.0.1 netmask 255.255.255.0 broadcast 192.168.0.255
        post-down /sbin/ifconfig eth0:1 down

The routing table from the node :
Code: 
root@tanenbaum:~# route
Table de routage IP du noyau
Destination     Passerelle      Genmask         Indic Metric Ref    Use Iface
prod-infra-1    *               255.255.255.255 UH    0      0        0 venet0
bck-bdd-1       *               255.255.255.255 UH    0      0        0 venet0
prod-bdd-1      *               255.255.255.255 UH    0      0        0 venet0
prod-mail-1     *               255.255.255.255 UH    0      0        0 venet0
prod-web-1      *               255.255.255.255 UH    0      0        0 venet0
E.F.G.0     *               255.255.255.0   U     0      0        0 eth0
default         E.F.G.254   0.0.0.0         UG    0      0        0 eth0

I tried a lot of things but I'm still not able to have a full access to my sites from my Apache VE (prod-web-1) :(
Do you have an idea ?

Thanks !
Romain
 
No I run this from inside Proxmod (from inside a VE).
And PORT FORWARDING of port 80 is already enabled (as you can see on my NAT configuration).
 
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