Linux routing question
Hi,
I have a linux alpine 2.6.1 with 2 network adapters and two windows hosts, one on each network. I cannot get host1 and host2 to communicate in both directions.
host1 <--> eth1 <--LINUX--> eth2 <-host2>
I can ping from : host2 to host1
host2 to eth1
eth2 to eth1
eth1 to eth2
eth1 to host1
But I cannot ping from eth1 to host2 or host1 to host2. Why??
All firewalls are disabled. Iptables on the linux shows ACCEPT ALL on input,output and forward.
Primaraly I should be able to ping host1 from eth2 because I can ping it from eth1.
I have of course enabled ip-forwarding.
Any ideas?
Am I missing a static route?
//zazagor
I have a linux alpine 2.6.1 with 2 network adapters and two windows hosts, one on each network. I cannot get host1 and host2 to communicate in both directions.
host1 <--> eth1 <--LINUX--> eth2 <-host2>
I can ping from : host2 to host1
host2 to eth1
eth2 to eth1
eth1 to eth2
eth1 to host1
But I cannot ping from eth1 to host2 or host1 to host2. Why??
All firewalls are disabled. Iptables on the linux shows ACCEPT ALL on input,output and forward.
Primaraly I should be able to ping host1 from eth2 because I can ping it from eth1.
I have of course enabled ip-forwarding.
Any ideas?
Am I missing a static route?
//zazagor
ASKER CERTIFIED SOLUTION
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In fact I don't think alpine linux does have a sysctl.conf file. Please add it inside your /etc/rc.local or similar file which will run during the startup. Unfortunately alpine linux documents do not metion a reference where to put the command.
will you provide the ouput of:
cat /proc/sys/net/ipv4/ip_forw
if it is 0 then routing is not enabled. If it is please check host1 and host2 and just make sure that their Default Gateway is the router system Ethernet at their side.
Cheers,
K.
cat /proc/sys/net/ipv4/ip_forw
if it is 0 then routing is not enabled. If it is please check host1 and host2 and just make sure that their Default Gateway is the router system Ethernet at their side.
Cheers,
K.
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SOLUTION
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Will you post your outoput
from host 1:
traceroute -d host2
From host 2:
traceroute -d host1
from host 1:
traceroute -d host2
From host 2:
traceroute -d host1
Oops sorry please use :
traceroute -dn hostx
x is 1 or 2 depending on what system you execute the command.
traceroute -dn hostx
x is 1 or 2 depending on what system you execute the command.
Hi KeremE, traceroute works on the ICMP protocol, zazagor is not able to ping how do you think traceroute is going to work. Moreover traceroute is to detect routing faults not connectivity..
Cheers..
Cheers..
@expert_tanmay:
> Hi KeremE, traceroute works on the ICMP protocol, zazagor is not able to ping how do you think
How about a "careful" reading through the original question?:
> But I cannot ping from eth1 to host2 or host1 to host2. Why??
Cheers,
K
> Hi KeremE, traceroute works on the ICMP protocol, zazagor is not able to ping how do you think
How about a "careful" reading through the original question?:
> But I cannot ping from eth1 to host2 or host1 to host2. Why??
Cheers,
K
Sorry KeremE you are right looks like some routing problem. zazagor please can you let us know the routing table of host1, Linux and host2.
Cheers..
No problem :) Lets see but it seems that the Q is already abandoned : (
ASKER
Sorry guys...I'm totally drunk
ASKER
-I have of course enabled ip-forwarding
I have bouble checked that the file /proc/sys/net/ipv4/ip_forw
and that
/etc/sysctl.conf:
net.ipv4.ip_forward = 1
Other ideas?
//zazagor