Hello people,
I have a little problem with one linux box that route some local IP
networks between them and internet.
An schema from the IP point of view is this:
(3 uplinks)
INTERNET <---> route <---> LANS
From ethernet point of view is this:
INET link 1 <---> <---> INET link 3
INET link 2 <---> router <---> LANs
Physically there are 3 ethernet networks, one for the uplink 1, other
for uplink 2, and the third is for the lans and the uplink 3.
I forced to share the ethernet for the LANs and uplink 3.
The router has 4 interfaces, eth1 for uplink 1, eth2 for uplink 2, eth3
for uplink 3 and eth0 for the LANs.
The problem I have is that, without a constant time or reason, sometimes
I detect latences between uplink 3 and the router, and other times
between the router and LAN hosts.
I think that I need to configure something in eth3 config files
(/proc/sys/net/ipv4/conf/eth3) to disallow local frames and allow only
the router and uplink 3 gateway comunication, but I don't found anything
that help me.
I tried with arp_filter, rp_filter, and many of them, but without
success (I don't found many documentation about it, and I review lartc
and googled about that parameters).
I think that only allowing arp traffic betwen eth3 and uplink 3 gateway
(using arptables) will solve this, but I don't know if arptables will be
the solution or not.
Do anybody help me a bit?
Thanks!!
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