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| Servers & Networking Discuss any Fedora server problems and Networking issues such as dhcp, IP numbers, wlan, modems, etc. |
25th June 2011, 09:09 AM
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Join Date: Jul 2007
Posts: 15
 
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Virtual network/routing problem in FC15 (no problem in FC14, FC13)
i've been using a virtual machine as an internet gateway since FC13. on the virtual machine, eth0 is bridged to eth0 of the host, and eth1 is from the default virtual network (NAT) of libvirt. the virtual machine thus provides internet connection to the host as shown below:
{INTERNET} <---> [eth0-VM-eth1] <---> [virbr0-Host]
this configuration works fine on FC13 and FC14. however, after i installed a fresh FC15 and setup virtualization the exact same way i did before on FC13 and FC14, the host cannot obtain internet connection from the virtual machine.
i actually have another virtual machine, which also obtains its internet connection from the aforementioned virtual machine (also via NAT). there is no problem on the second virtual machine getting internet connection from the first virtual machine though.
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25th June 2011, 10:08 AM
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Join Date: Oct 2008
Location: Poland
Posts: 49
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by wlpl
i've been using a virtual machine as an internet gateway since FC13. on the virtual machine, eth0 is bridged to eth0 of the host, and eth1 is from the default virtual network (NAT) of libvirt. the virtual machine thus provides internet connection to the host as shown below:
{INTERNET} <---> [eth0-VM-eth1] <---> [virbr0-Host]
this configuration works fine on FC13 and FC14. however, after i installed a fresh FC15 and setup virtualization the exact same way i did before on FC13 and FC14, the host cannot obtain internet connection from the virtual machine.
i actually have another virtual machine, which also obtains its internet connection from the aforementioned virtual machine (also via NAT). there is no problem on the second virtual machine getting internet connection from the first virtual machine though.
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Could you give more details about your configuration? What IP address is on the host and how you noticed that Internet connection dosen't work ?
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25th June 2011, 01:21 PM
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by Raffaello22
Could you give more details about your configuration? What IP address is on the host and how you noticed that Internet connection dosen't work ?
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eth0 on VM1: real IP from ISP
eth1 on VM1: 192.168.1.2
virbr0 on host: 192.168.1.1
after "route add default gw 192.168.1.2" on host, and type "route" again to show the routing table, the routing table hangs for quite a while before the added "default gw 192.168.1.2" shows.
internet connection works on VM1 and VM2 e.g. can ping www.google.com
internet connection does not work on host i.e. cannot ping www.google.com
Last edited by wlpl; 25th June 2011 at 01:31 PM.
Reason: p.s. the same things work in FC13 and FC14. what has changed in networking/virtual networking in FC15?
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25th June 2011, 02:05 PM
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Join Date: Oct 2008
Location: Poland
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by wlpl
eth0 on VM1: real IP from ISP
eth1 on VM1: 192.168.1.2
virbr0 on host: 192.168.1.1
after "route add default gw 192.168.1.2" on host, and type "route" again to show the routing table, the routing table hangs for quite a while before the added "default gw 192.168.1.2" shows.
internet connection works on VM1 and VM2 e.g. can ping www.google.com
internet connection does not work on host i.e. cannot ping www.google.com |
Hello,
Type on host:
route -rn
ping 192.168.1.2
ping 194.204.159.1
traceroute 194.204.159.1
and paste output here.
Edit:
Do you have enable ip forwarding ? if not:
Code:
echo "1" > /proc/sys/net/ipv4/ip_forward
best regards,
Last edited by Raffaello22; 25th June 2011 at 02:26 PM.
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25th June 2011, 02:35 PM
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Join Date: Jul 2007
Posts: 15
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by Raffaello22
Hello,
Type on host:
route -rn
ping 192.168.1.2
ping 194.204.159.1
traceroute 194.204.159.1
and paste output here.
Edit:
Do you have enable ip forwarding ? if not:
Code:
echo "1" > /proc/sys/net/ipv4/ip_forward
best regards, |
do i type those commands on host with or without my "route add default gw 192.168.1.2"?
do you mean IP forwarding on host or VM?
thanks.
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25th June 2011, 02:45 PM
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Join Date: Oct 2008
Location: Poland
Posts: 49
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by wlpl
do i type those commands on host with or without my "route add default gw 192.168.1.2"?
do you mean IP forwarding on host or VM?
thanks.
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You should IP address and default gateway configured on host before you type this commands.
IP forwarding should be enable on rouer (VM in this case). Eventually you can also check firewall on VM and temporary disabled iptables.
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26th June 2011, 12:13 PM
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by Raffaello22
You should IP address and default gateway configured on host before you type this commands.
IP forwarding should be enable on rouer (VM in this case). Eventually you can also check firewall on VM and temporary disabled iptables.
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IP forwarding is enabled on the VM.
here are the results:
Code:
ping 192.168.1.2
64 bytes from 192.168.1.2: icmp_req=1 ttl=64 time=0.185 ms
64 bytes from 192.168.1.2: icmp_req=2 ttl=64 time=0.195 ms
...
Code:
ping 194.204.159.1
64 bytes from 194.204.159.1: icmp_req=1 ttl=235 time=357 ms
64 bytes from 194.204.159.1: icmp_req=2 ttl=235 time=368 ms
...
Code:
traceroute to 194.204.159.1 (194.204.159.1), 30 hops max, 60 byte packets
1 192.168.1.2 (192.168.1.2) 0.185 ms 0.169 ms 0.387 ms
2 10.99.144.1 (10.99.144.1) 7.997 ms * *
3 10.255.99.253 (10.255.99.253) 18.774 ms 18.832 ms 18.934 ms
4 192.168.116.157 (192.168.116.157) 18.669 ms 18.851 ms 18.956 ms
5 192.168.66.45 (192.168.66.45) 17.522 ms 17.582 ms 17.628 ms
6 192.168.67.121 (192.168.67.121) 17.680 ms 192.168.66.109 (192.168.66.109) 10.250 ms 15.381 ms
7 192.168.64.113 (192.168.64.113) 30.189 ms 34.867 ms 192.168.64.109 (192.168.64.109) 34.982 ms
8 61.10.0.109 (61.10.0.109) 34.988 ms 61.10.0.113 (61.10.0.113) 34.965 ms 61.10.0.117 (61.10.0.117) 34.955 ms
9 61.10.0.65 (61.10.0.65) 36.279 ms 36.361 ms 61.10.0.102 (61.10.0.102) 34.896 ms
10 61.10.0.65 (61.10.0.65) 36.391 ms 203.131.245.237 (203.131.245.237) 37.341 ms 61.10.0.65 (61.10.0.65) 36.125 ms
11 129.250.3.194 (129.250.3.194) 37.223 ms * 34.891 ms
12 129.250.3.192 (129.250.3.192) 40.860 ms 129.250.2.148 (129.250.2.148) 55.488 ms 129.250.3.192 (129.250.3.192) 20.295 ms
13 129.250.2.6 (129.250.2.6) 64.972 ms 129.250.3.197 (129.250.3.197) 181.963 ms 129.250.2.6 (129.250.2.6) 64.944 ms
14 129.250.2.2 (129.250.2.2) 64.930 ms 65.014 ms 64.913 ms
15 * * 129.250.2.164 (129.250.2.164) 177.168 ms
16 129.250.5.32 (129.250.5.32) 181.008 ms 129.250.9.98 (129.250.9.98) 186.537 ms 129.250.5.32 (129.250.5.32) 188.218 ms
17 * 193.251.241.14 (193.251.241.14) 267.218 ms *
18 129.250.9.98 (129.250.9.98) 184.770 ms 184.651 ms 191.884 ms
19 193.251.241.14 (193.251.241.14) 285.385 ms 276.357 ms 285.437 ms
20 193.251.240.249 (193.251.240.249) 325.245 ms * 327.807 ms
21 195.205.0.214 (195.205.0.214) 377.967 ms 193.251.128.14 (193.251.128.14) 378.760 ms 195.205.0.214 (195.205.0.214) 381.308 ms
22 * * *
23 195.205.0.214 (195.205.0.214) 378.598 ms 378.937 ms 383.278 ms
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
you said "route -rn" but there's no option "r" for "route".
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26th June 2011, 12:15 PM
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Registered User
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Join Date: Oct 2008
Location: Poland
Posts: 49
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by wlpl
IP forwarding is enabled on the VM.
here are the results:
Code:
ping 192.168.1.2
64 bytes from 192.168.1.2: icmp_req=1 ttl=64 time=0.185 ms
64 bytes from 192.168.1.2: icmp_req=2 ttl=64 time=0.195 ms
...
Code:
ping 194.204.159.1
64 bytes from 194.204.159.1: icmp_req=1 ttl=235 time=357 ms
64 bytes from 194.204.159.1: icmp_req=2 ttl=235 time=368 ms
...
Code:
traceroute to 194.204.159.1 (194.204.159.1), 30 hops max, 60 byte packets
1 192.168.1.2 (192.168.1.2) 0.185 ms 0.169 ms 0.387 ms
2 10.99.144.1 (10.99.144.1) 7.997 ms * *
3 10.255.99.253 (10.255.99.253) 18.774 ms 18.832 ms 18.934 ms
4 192.168.116.157 (192.168.116.157) 18.669 ms 18.851 ms 18.956 ms
5 192.168.66.45 (192.168.66.45) 17.522 ms 17.582 ms 17.628 ms
6 192.168.67.121 (192.168.67.121) 17.680 ms 192.168.66.109 (192.168.66.109) 10.250 ms 15.381 ms
7 192.168.64.113 (192.168.64.113) 30.189 ms 34.867 ms 192.168.64.109 (192.168.64.109) 34.982 ms
8 61.10.0.109 (61.10.0.109) 34.988 ms 61.10.0.113 (61.10.0.113) 34.965 ms 61.10.0.117 (61.10.0.117) 34.955 ms
9 61.10.0.65 (61.10.0.65) 36.279 ms 36.361 ms 61.10.0.102 (61.10.0.102) 34.896 ms
10 61.10.0.65 (61.10.0.65) 36.391 ms 203.131.245.237 (203.131.245.237) 37.341 ms 61.10.0.65 (61.10.0.65) 36.125 ms
11 129.250.3.194 (129.250.3.194) 37.223 ms * 34.891 ms
12 129.250.3.192 (129.250.3.192) 40.860 ms 129.250.2.148 (129.250.2.148) 55.488 ms 129.250.3.192 (129.250.3.192) 20.295 ms
13 129.250.2.6 (129.250.2.6) 64.972 ms 129.250.3.197 (129.250.3.197) 181.963 ms 129.250.2.6 (129.250.2.6) 64.944 ms
14 129.250.2.2 (129.250.2.2) 64.930 ms 65.014 ms 64.913 ms
15 * * 129.250.2.164 (129.250.2.164) 177.168 ms
16 129.250.5.32 (129.250.5.32) 181.008 ms 129.250.9.98 (129.250.9.98) 186.537 ms 129.250.5.32 (129.250.5.32) 188.218 ms
17 * 193.251.241.14 (193.251.241.14) 267.218 ms *
18 129.250.9.98 (129.250.9.98) 184.770 ms 184.651 ms 191.884 ms
19 193.251.241.14 (193.251.241.14) 285.385 ms 276.357 ms 285.437 ms
20 193.251.240.249 (193.251.240.249) 325.245 ms * 327.807 ms
21 195.205.0.214 (195.205.0.214) 377.967 ms 193.251.128.14 (193.251.128.14) 378.760 ms 195.205.0.214 (195.205.0.214) 381.308 ms
22 * * *
23 195.205.0.214 (195.205.0.214) 378.598 ms 378.937 ms 383.278 ms
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
you said "route -rn" but there's no option "r" for "route". |
Hello,
You have problem with DNS. Setting correctly DNS Servers in /etc/resolv.conf
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26th June 2011, 03:22 PM
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Registered User
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Join Date: Jul 2007
Posts: 15
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by Raffaello22
Hello,
You have problem with DNS. Setting correctly DNS Servers in /etc/resolv.conf
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the entries in resolv.conf is the same in the host and the VM. however, NetworkManager says not to put DNS settings in resolv.conf, that they should go in ifcfg files instead. could it be NetworkManager that is causing the trouble? i have disabled NetworkManager by "systemctl disable NetworkManager.service" and have been using network instead. and if i were to put DNS settings in ifcfg files as instructed, where is the ifcfg for virbr0?
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26th June 2011, 03:40 PM
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Registered User
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Join Date: Oct 2008
Location: Poland
Posts: 49
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
In directory:
Code:
/etc/sysconfig/network-scripts/
if file ifcfg-vibr0 doesn't exist in this directory create this file.
content example:
Code:
DEVICE="eth0"
BOOTPROTO="dhcp"
HWADDR="08:00:27:38:4D:5E"
NM_CONTROLLED="yes"
ONBOOT="yes"
but you can put DNS settings in /etc/sysconfig/network file using directive:
DNS1=IP_ADDRESS_DNS1_SERVER
DNS2=IP_ADDRESS_DNS1_SERVER
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26th June 2011, 04:06 PM
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Registered User
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Join Date: Jul 2007
Posts: 15
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by Raffaello22
In directory:
Code:
/etc/sysconfig/network-scripts/
if file ifcfg-vibr0 doesn't exist in this directory create this file.
content example:
Code:
DEVICE="eth0"
BOOTPROTO="dhcp"
HWADDR="08:00:27:38:4D:5E"
NM_CONTROLLED="yes"
ONBOOT="yes"
but you can put DNS settings in /etc/sysconfig/network file using directive:
DNS1=IP_ADDRESS_DNS1_SERVER
DNS2=IP_ADDRESS_DNS1_SERVER |
i'm not sure about the first method cuz virbr0 is a virtual interface created by libvirt.
i tried the second method (put in /etc/sysconfig/network). it would automatically create the entries i put in /etc/sysconfig/network in /etc/resolv.conf, but it still doesn't work.
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26th June 2011, 05:59 PM
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Join Date: Oct 2008
Location: Poland
Posts: 49
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by wlpl
i'm not sure about the first method cuz virbr0 is a virtual interface created by libvirt.
i tried the second method (put in /etc/sysconfig/network). it would automatically create the entries i put in /etc/sysconfig/network in /etc/resolv.conf, but it still doesn't work.
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Type:
Do you see resolved IP address for www.wp.pl domain ? If not, you have incorrectly configured DNS Server(Servers) in /etc/resolv.conf
Try in web browser 212.77.100.101. Do you see web page ?
Try once again ping any external address like:
194.204.159.1
212.77.100.101
if success, check if you don't have blocking port 53 on firewall.
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28th June 2011, 02:01 PM
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Join Date: Jul 2007
Posts: 15
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Re: Virtual network/routing problem in FC15 (no problem in FC14, FC13)
Quote:
Originally Posted by Raffaello22
Type:
Do you see resolved IP address for www.wp.pl domain ? If not, you have incorrectly configured DNS Server(Servers) in /etc/resolv.conf
Try in web browser 212.77.100.101. Do you see web page ?
Try once again ping any external address like:
194.204.159.1
212.77.100.101
if success, check if you don't have blocking port 53 on firewall. |
cannot resolve www.wp.pl
cannot get to 212.77.100.101 on web browser.
can ping those 2 external IP.
port 53 isn't blocked.
my DNS in /etc/resolv.conf is like:
Code:
nameserver 11.22.33.44
nameserver 44.33.22.11
everything looks right (and identical in fc13 and fc14). yet things don't work.
---------- Post added at 09:01 PM ---------- Previous post was at 09:39 AM ----------
i've submitted a bug report https://bugzilla.redhat.com/show_bug.cgi?id=717254
thank you Raffaello22 for having been trying to help me.
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