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Operating Systems
Linux
Issue with ethernet interface
Post 302889454 by Perderabo on Thursday 20th of February 2014 04:58:00 PM
02-20-2014
We have a terminology problem here. There must be (in general) one gateway per interface. However, there should only be a single default gateway. If there is only one interface and therefore only one gateway it will be the default gateway. If you have several interfaces with several gateways, you must anoint one as the default gateway by putting it in /etc/sysconfig/network. Meanwhile every interface must have its own gateway defined in the interface script.
cerco, suppose that you got your system to work with a single gateway. And assume that from some distant IP address I ping your box on the IP address on eth2. How do you respond? You can't send a packet out eth2, it doesn't know how to reach me (no gateway). Do you send the packet out eth0 to the only gateway you know? What to use for the source IP address? Do I ping one IP address and get and response from a different IP?
**edit**
I have some more time after all... my meeting just got canceled
So if you try to reach some distant IP address, with your setup, the default gateway will tell you which interface to use. But if you have decided to use the second interface, you need some gateway for it. If there are just a few hosts that you talk to on the second interface and they are all on the same subnet as your interface you should be ok with no gateway. But that does not seem like what you have.
If the system is using dynamic routing which means that gated is running you can dynamically switch default gateways. This allows the router (which is what your system would be at this point) to adapt to network outages and exploit redunant routes.
cerco, suppose that you got your system to work with a single gateway. And assume that from some distant IP address I ping your box on the IP address on eth2. How do you respond? You can't send a packet out eth2, it doesn't know how to reach me (no gateway). Do you send the packet out eth0 to the only gateway you know? What to use for the source IP address? Do I ping one IP address and get and response from a different IP?
**edit**
I have some more time after all... my meeting just got canceled
So if you try to reach some distant IP address, with your setup, the default gateway will tell you which interface to use. But if you have decided to use the second interface, you need some gateway for it. If there are just a few hosts that you talk to on the second interface and they are all on the same subnet as your interface you should be ok with no gateway. But that does not seem like what you have.
If the system is using dynamic routing which means that gated is running you can dynamically switch default gateways. This allows the router (which is what your system would be at this point) to adapt to network outages and exploit redunant routes.
Last edited by Perderabo; 02-20-2014 at 06:21 PM..
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LEARN ABOUT SUSE
rarpd
RARPD(8) System Manager's Manual RARPD(8) NAME
rarpd - reverse address resolution protocol daemon SYNOPSIS
rarpd [-v] [-i interface ] DESCRIPTION
Rarpd listens on the ethernet for broadcast packets asking for reverse address resolution. These packets are sent by hosts at boot time to find out their IP address. Rarpd looks up the six octet ethernet number in the ethers map finding a host name. This name is translated to the IP address of the host by a DNS lookup. The IP address is then sent to the host. Before rarpd can start its service it first finds out what the IP address and hardware address of the ethernet is. Warning! Sun diskless workstations assume that the first RARP server that answers is the host they are to boot from. For this to work all other Sun RARP servers delay their answer if they are not also the requestors boot server. This rarpd does not have this kludge so it will happily engage the Sun boot server to see who can answer the client first. Unless your host can actually serve a Sun diskless client, it is better not to list any more hosts in the ethers file than necessary. OPTIONS
-v Be verbose. Show requests which the daemon is responding to. -i Bind to the named interface. By default rarpd binds to the default interface for the local system type, if available. SEE ALSO
ifconfig(8), ethers(5), hosts(5), AUTHOR
Derrick J. Brashear (shadow@dementia.org) The man page is mostly from the Minix version, by Kees J. Bot (kjb@cs.vu.nl) RARPD(8)