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no dns with gentoo and openwrt router [solved - workaround]
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DaggyStyle
Watchman
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Joined: 22 Mar 2006
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PostPosted: Tue Jul 14, 2015 8:06 pm    Post subject: no dns with gentoo and openwrt router [solved - workaround] Reply with quote

Greetings,

I've got a new router and installed openwrt on it, since then I'm getting a weird behavior on my gentoo, after boot, I have no DNS, this causes ping www.ask.com to fail.
but if I restart the bridge, it works ok.

any ideas what might be the issue?
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Last edited by DaggyStyle on Thu Jul 16, 2015 6:58 pm; edited 1 time in total
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Tony0945
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PostPosted: Tue Jul 14, 2015 9:42 pm    Post subject: Reply with quote

Ask yourself, "What was the last thing I changed?"
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DaggyStyle
Watchman
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Joined: 22 Mar 2006
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PostPosted: Wed Jul 15, 2015 4:12 pm    Post subject: Reply with quote

Tony0945 wrote:
Ask yourself, "What was the last thing I changed?"


seriously? check my previous post.
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baaann
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PostPosted: Thu Jul 16, 2015 12:24 pm    Post subject: Reply with quote

I haven't got a new router but I did have the same issue earlier in the week.

When I checked /etc/resolv.conf it was empty, as far as I could ascertain a file could not be found when writing it during boot. I didn't have a lot of time and had long been intending to try DHCPCD. It worked a treat and has been fine since. So I suggest you check your resolv.conf when your DNS is missing(temporary fix add router address to it)
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szatox
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PostPosted: Thu Jul 16, 2015 5:57 pm    Post subject: Reply with quote

A shot in the dark, dhcpd starts before your LAN has it's IP assigned.
This way dhcpd doesn't know it's supposed to listen there and ignores incoming requests, so your clients either don't have IP set at all or configure it with other mechanisms, that can't provide gateway or dns IPs
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DaggyStyle
Watchman
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Joined: 22 Mar 2006
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PostPosted: Thu Jul 16, 2015 6:57 pm    Post subject: Reply with quote

szatox wrote:
A shot in the dark, dhcpd starts before your LAN has it's IP assigned.
This way dhcpd doesn't know it's supposed to listen there and ignores incoming requests, so your clients either don't have IP set at all or configure it with other mechanisms, that can't provide gateway or dns IPs


how is that even possible?
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DaggyStyle
Watchman
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Joined: 22 Mar 2006
Posts: 5270

PostPosted: Thu Jul 16, 2015 6:58 pm    Post subject: Reply with quote

baaann wrote:
I haven't got a new router but I did have the same issue earlier in the week.

When I checked /etc/resolv.conf it was empty, as far as I could ascertain a file could not be found when writing it during boot. I didn't have a lot of time and had long been intending to try DHCPCD. It worked a treat and has been fine since. So I suggest you check your resolv.conf when your DNS is missing(temporary fix add router address to it)


that is correct, /etc/resolv.conf was empty.

so I've worked around it for now by disabling dns and defining it hardcoded.

that solves the issue for now.
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