Arch Linux

jeffmikels

Member

Registered: 2007-04-19

Posts: 37

[SOLVED]: My Arch Box can't ping my router, but everything else can.

I hope this is an easy fix... I recently upgraded my Archlinux Server completely. Everything is new except for the hard drives. I have reconfigured it all, and it all was working fine yesterday; however, this morning my Archlinux Server isn't able to access my home network router or anything outside my home network.

My network topology works like this: INTERNET -> CABLE MODEM -> BELKIN ROUTER -> [SWITCH A & SWITCH B]

SWITCH A -> Archlinux box (and other things)
SWITCH B -> Mac Pro (and other things)

These are my strange network symptoms:

1. my Mac can login by ssh to my Archlinux box, can ping my Archlinux box, can ping my router.
2. my Archlinux box can login by ssh to my Mac, can ping my Mac, can NOT ping my router.
3. my Mac can access the full Internet and local addresses.
4. my Archlinux box can access all LAN addresses (except the router), and can NOT access any WAN addresses.

NOTE: I am testing all of this using IPv4 addresses and not domain names at all.
NOTE2: I have not done any testing with IPv6 because I don't really understand it yet.

Can anyone help me here?

Last edited by jeffmikels (2012-07-10 18:40:04)

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...using Arch as a home server since 2006.

fiddlinmacx

Member

Registered: 2011-03-02

Posts: 89

Re: [SOLVED]: My Arch Box can't ping my router, but everything else can.

Have you tried resetting the switches? Your MAC address has changed, that might be causing the problem. Perhaps your router has MAC filtering enabled?

jeffmikels

Member

Registered: 2007-04-19

Posts: 37

Re: [SOLVED]: My Arch Box can't ping my router, but everything else can.

No MAC filtering enabled on the router.

I tried the following steps with interesting results:

1. I installed a second NIC into the Archlinux computer.
2. Arch initialized the new NIC as eth0 and the old NIC as eth1 // eth0 is configured with a static IP of 192.168.10.101
3. I rebooted and ran dhcpcd on the old NIC (eth1) // it was assigned 192.168.10.136
4. I disabled eth0
5. Now I had full internet access, could ping the router and everything. However, since this is a server, I need it to be on 192.168.10.101.

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...using Arch as a home server since 2006.

jeffmikels

Member

Registered: 2007-04-19

Posts: 37

Re: [SOLVED]: My Arch Box can't ping my router, but everything else can.

SOLVED:

I disabled ipv6 using the notes in the Archlinux Wiki, and everything works fine now.

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...using Arch as a home server since 2006.