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Old 01-31-2008, 10:29 AM   #1
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Distribution: Arch, Debian, Slack
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ipv6 errors - "Unknown symbol?"

I'm getting a bunch of these errors on boot:

ipv6: Unknown symbol: __ipv6_addr_type
ipv6: Unknown symbol: inet6_lookup
ipv6: Unknown symbol: secure_tcpv6_sequence_number
ipv6: Unknown symbol: ipv6_skip_exthdr
ipv6: Unknown symbol: ipv6_ext_hdr
ipv6: Unknown symbol: __inet6_lookup_established
ipv6: Unknown symbol: __inet6_hash
ipv6: Unknown symbol: inet6_lookup_listener

And it repeats like that at least 5-10 times in between starting services.

There is no ipv6 module loaded, and I have net.ipv6.ip_forward=1 commented out in /etc/sysctrl.conf. I've been having some network problems and I'm just wondering if this might have anything to do with it. I just noticed the errors now, so I'm not sure how long they've been there.

Is it just because there's no ipv6 module? I'd just like to know where the errors are generated from or if that's normal behavior. I'm guessing that every time some sort of network service starts it checks something to do with ipv6 and isn't finding it, causing the message. But I just want to be sure it's not messing up the network (there's massive slowdowns/lockups, where it will take like a minute to ssh in, and you can see the lag when you type things, then it will just lock up, etc.).

Also (unrelated) - can anyone tell me how to increase the scroll back buffer on the boot up console? it's only going back about one screen and I can't see any of the earlier messages. thanks!
Old 01-31-2008, 01:06 PM   #2
Registered: May 2004
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I've seen this on one of my machines before.. All it means is that there is no ipv6 stuff to work with.

and to get rid of the IPv6 stuff it should be as simple as adding the lines:
alias net-pf-10 off
alias ipv6 off
to /etc/modprobe.d/00local (creating the file if it exists).
Old 02-01-2008, 02:42 PM   #3
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thanks, I just wanted to make sure that wasn't an issue. I made the 00local file, but there's no monitor hooked up now so i can't see if it worked or not. dmesg still shows the ipv6 errors, so maybe not. I noticed there's a "net-pf-10 ipv6" in /etc/modprobe.d/aliases, I wonder if local would override that or not? I'll test it just out of curiosity, but it's not a big deal. thanks.


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