ARP flux how to solve
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I have a server with 2 NICs having an IP address in the same subnet, this is what my /etc/network/interfaces looks like:
auto eth0
iface eth0 inet static
address 192.168.2.155
gateway 192.168.2.51
netmask 255.255.255.0
dns-nameservers 192.168.2.180
dns-domain exaple.com
auto eth1
iface eth1 inet static
address 192.168.2.156
netmask 255.255.255.0
So the idea is that eth0 with ip 192.168.2.155 is the 'management' interface with internet connectivity.
The eth1 NIC with IP 192.168.2.156 will be used to communicate with internal devices.
Now When i configure this with a default system, and try to ping eth1 on 192.168.2.156 with other devices on the LAN, these packets are not being received by eth1 as one would expect, but by eth0, I verified this by running tcpdump -i eth1 icmp, and can see no packets coming in. The client doing the ping is getting a reply, but from the wrong NIC/MAC address.
Now I've found out that this phenomenon is called 'ARP flux' and even nice articles describing how to solve it, problem is, none of these solutions seem to work for me.
This article seems to give the best explanation and fix, by running the following commands:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=0
This seems to do something, in that I start receiving packets on eth1, but it completely disables any communication on eth0 and IP address 192.168.2.155.
Any other ideas as to what I could try?
networking server ethernet
asked Jan 27 '15 at 0:39
AlexAlex
12116
add a comment |
I have a server with 2 NICs having an IP address in the same subnet, this is what my /etc/network/interfaces looks like:
auto eth0
iface eth0 inet static
address 192.168.2.155
gateway 192.168.2.51
netmask 255.255.255.0
dns-nameservers 192.168.2.180
dns-domain exaple.com
auto eth1
iface eth1 inet static
address 192.168.2.156
netmask 255.255.255.0
So the idea is that eth0 with ip 192.168.2.155 is the 'management' interface with internet connectivity.
The eth1 NIC with IP 192.168.2.156 will be used to communicate with internal devices.
Now When i configure this with a default system, and try to ping eth1 on 192.168.2.156 with other devices on the LAN, these packets are not being received by eth1 as one would expect, but by eth0, I verified this by running tcpdump -i eth1 icmp, and can see no packets coming in. The client doing the ping is getting a reply, but from the wrong NIC/MAC address.
Now I've found out that this phenomenon is called 'ARP flux' and even nice articles describing how to solve it, problem is, none of these solutions seem to work for me.
This article seems to give the best explanation and fix, by running the following commands:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=0
This seems to do something, in that I start receiving packets on eth1, but it completely disables any communication on eth0 and IP address 192.168.2.155.
Any other ideas as to what I could try?
networking server ethernet
asked Jan 27 '15 at 0:39
AlexAlex
12116
add a comment |
I have a server with 2 NICs having an IP address in the same subnet, this is what my /etc/network/interfaces looks like:
auto eth0
iface eth0 inet static
address 192.168.2.155
gateway 192.168.2.51
netmask 255.255.255.0
dns-nameservers 192.168.2.180
dns-domain exaple.com
auto eth1
iface eth1 inet static
address 192.168.2.156
netmask 255.255.255.0
So the idea is that eth0 with ip 192.168.2.155 is the 'management' interface with internet connectivity.
The eth1 NIC with IP 192.168.2.156 will be used to communicate with internal devices.
Now When i configure this with a default system, and try to ping eth1 on 192.168.2.156 with other devices on the LAN, these packets are not being received by eth1 as one would expect, but by eth0, I verified this by running tcpdump -i eth1 icmp, and can see no packets coming in. The client doing the ping is getting a reply, but from the wrong NIC/MAC address.
Now I've found out that this phenomenon is called 'ARP flux' and even nice articles describing how to solve it, problem is, none of these solutions seem to work for me.
This article seems to give the best explanation and fix, by running the following commands:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=0
This seems to do something, in that I start receiving packets on eth1, but it completely disables any communication on eth0 and IP address 192.168.2.155.
Any other ideas as to what I could try?
networking server ethernet
asked Jan 27 '15 at 0:39
AlexAlex
12116
I have a server with 2 NICs having an IP address in the same subnet, this is what my /etc/network/interfaces looks like:
auto eth0
iface eth0 inet static
address 192.168.2.155
gateway 192.168.2.51
netmask 255.255.255.0
dns-nameservers 192.168.2.180
dns-domain exaple.com
auto eth1
iface eth1 inet static
address 192.168.2.156
netmask 255.255.255.0
So the idea is that eth0 with ip 192.168.2.155 is the 'management' interface with internet connectivity.
The eth1 NIC with IP 192.168.2.156 will be used to communicate with internal devices.
Now When i configure this with a default system, and try to ping eth1 on 192.168.2.156 with other devices on the LAN, these packets are not being received by eth1 as one would expect, but by eth0, I verified this by running tcpdump -i eth1 icmp, and can see no packets coming in. The client doing the ping is getting a reply, but from the wrong NIC/MAC address.
Now I've found out that this phenomenon is called 'ARP flux' and even nice articles describing how to solve it, problem is, none of these solutions seem to work for me.
This article seems to give the best explanation and fix, by running the following commands:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=0
This seems to do something, in that I start receiving packets on eth1, but it completely disables any communication on eth0 and IP address 192.168.2.155.
Any other ideas as to what I could try?
networking server ethernet
networking server ethernet
asked Jan 27 '15 at 0:39
AlexAlex
12116
asked Jan 27 '15 at 0:39
AlexAlex
12116
asked Jan 27 '15 at 0:39
AlexAlex
12116
asked Jan 27 '15 at 0:39
AlexAlex
12116
asked Jan 27 '15 at 0:39
AlexAlex
12116
12116
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Based on this article Change to:
sysctl -w net.ipv4.conf.all.arp_ignore=1
sysctl -w net.ipv4.conf.all.arp_announce=2
sysctl -w net.ipv4.conf.all.arp_filter=1
answered Jan 27 '15 at 11:20
27079742707974
8,16852340
I just tried these but no luck, same result as before i.e.: All traffic shifts from eth0 to eth1 when running these commands
– Alex
Jan 27 '15 at 11:53
If eth0 you user only for access from internet, set interface to be in different network.
– 2707974
Jan 27 '15 at 12:02
Sorry not the answer I was hoping for... For reasons I don't think have to be discussed here, I have to use 2 IP addresses on the same subnet.
– Alex
Jan 28 '15 at 12:50
add a comment |
Based on this post and this post did you try with?:
net.ipv4.conf.default.rp_filter = 2
Did you fix it?
EDIT:
I mean... everything:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=2
answered Jan 20 '16 at 17:35
rasputinorasputino
1011
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Based on this article Change to:
sysctl -w net.ipv4.conf.all.arp_ignore=1
sysctl -w net.ipv4.conf.all.arp_announce=2
sysctl -w net.ipv4.conf.all.arp_filter=1
answered Jan 27 '15 at 11:20
27079742707974
8,16852340
I just tried these but no luck, same result as before i.e.: All traffic shifts from eth0 to eth1 when running these commands
– Alex
Jan 27 '15 at 11:53
If eth0 you user only for access from internet, set interface to be in different network.
– 2707974
Jan 27 '15 at 12:02
Sorry not the answer I was hoping for... For reasons I don't think have to be discussed here, I have to use 2 IP addresses on the same subnet.
– Alex
Jan 28 '15 at 12:50
add a comment |
Based on this article Change to:
sysctl -w net.ipv4.conf.all.arp_ignore=1
sysctl -w net.ipv4.conf.all.arp_announce=2
sysctl -w net.ipv4.conf.all.arp_filter=1
answered Jan 27 '15 at 11:20
27079742707974
8,16852340
I just tried these but no luck, same result as before i.e.: All traffic shifts from eth0 to eth1 when running these commands
– Alex
Jan 27 '15 at 11:53
If eth0 you user only for access from internet, set interface to be in different network.
– 2707974
Jan 27 '15 at 12:02
Sorry not the answer I was hoping for... For reasons I don't think have to be discussed here, I have to use 2 IP addresses on the same subnet.
– Alex
Jan 28 '15 at 12:50
add a comment |
Based on this article Change to:
sysctl -w net.ipv4.conf.all.arp_ignore=1
sysctl -w net.ipv4.conf.all.arp_announce=2
sysctl -w net.ipv4.conf.all.arp_filter=1
answered Jan 27 '15 at 11:20
27079742707974
8,16852340
Based on this article Change to:
sysctl -w net.ipv4.conf.all.arp_ignore=1
sysctl -w net.ipv4.conf.all.arp_announce=2
sysctl -w net.ipv4.conf.all.arp_filter=1
answered Jan 27 '15 at 11:20
27079742707974
8,16852340
answered Jan 27 '15 at 11:20
27079742707974
8,16852340
answered Jan 27 '15 at 11:20
27079742707974
8,16852340
answered Jan 27 '15 at 11:20
27079742707974
8,16852340
8,16852340
I just tried these but no luck, same result as before i.e.: All traffic shifts from eth0 to eth1 when running these commands
– Alex
Jan 27 '15 at 11:53
If eth0 you user only for access from internet, set interface to be in different network.
– 2707974
Jan 27 '15 at 12:02
Sorry not the answer I was hoping for... For reasons I don't think have to be discussed here, I have to use 2 IP addresses on the same subnet.
– Alex
Jan 28 '15 at 12:50
add a comment |
I just tried these but no luck, same result as before i.e.: All traffic shifts from eth0 to eth1 when running these commands
– Alex
Jan 27 '15 at 11:53
If eth0 you user only for access from internet, set interface to be in different network.
– 2707974
Jan 27 '15 at 12:02
Sorry not the answer I was hoping for... For reasons I don't think have to be discussed here, I have to use 2 IP addresses on the same subnet.
– Alex
Jan 28 '15 at 12:50
I just tried these but no luck, same result as before i.e.: All traffic shifts from eth0 to eth1 when running these commands
– Alex
Jan 27 '15 at 11:53
I just tried these but no luck, same result as before i.e.: All traffic shifts from eth0 to eth1 when running these commands
– Alex
Jan 27 '15 at 11:53
If eth0 you user only for access from internet, set interface to be in different network.
– 2707974
Jan 27 '15 at 12:02
If eth0 you user only for access from internet, set interface to be in different network.
– 2707974
Jan 27 '15 at 12:02
Sorry not the answer I was hoping for... For reasons I don't think have to be discussed here, I have to use 2 IP addresses on the same subnet.
– Alex
Jan 28 '15 at 12:50
Sorry not the answer I was hoping for... For reasons I don't think have to be discussed here, I have to use 2 IP addresses on the same subnet.
– Alex
Jan 28 '15 at 12:50
add a comment |
Based on this post and this post did you try with?:
net.ipv4.conf.default.rp_filter = 2
Did you fix it?
EDIT:
I mean... everything:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=2
answered Jan 20 '16 at 17:35
rasputinorasputino
1011
add a comment |
Based on this post and this post did you try with?:
net.ipv4.conf.default.rp_filter = 2
Did you fix it?
EDIT:
I mean... everything:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=2
answered Jan 20 '16 at 17:35
rasputinorasputino
1011
add a comment |
Based on this post and this post did you try with?:
net.ipv4.conf.default.rp_filter = 2
Did you fix it?
EDIT:
I mean... everything:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=2
answered Jan 20 '16 at 17:35
rasputinorasputino
1011
Based on this post and this post did you try with?:
net.ipv4.conf.default.rp_filter = 2
Did you fix it?
EDIT:
I mean... everything:
sudo sysctl -w net.ipv4.conf.all.arp_announce=1
sudo sysctl -w net.ipv4.conf.all.arp_ignore=2
sudo sysctl -w net.ipv4.conf.all.rp_filter=2
answered Jan 20 '16 at 17:35
rasputinorasputino
1011
edited Jan 21 '16 at 9:00
answered Jan 20 '16 at 17:35
rasputinorasputino
1011
answered Jan 20 '16 at 17:35
rasputinorasputino
1011
answered Jan 20 '16 at 17:35
rasputinorasputino
1011
1011
add a comment |
add a comment |
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