Arch Linux

nexus

Member

Registered: 2022-04-26

Posts: 9

archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

On a new machine, booted from the archiso, I can ping 8.8.8.8, but not other external IPs. For example

root@archiso ~ # ping ping.archlinux.org
PING redirect.archlinux.org (95.216.195.133) 56(84) bytes of data.
--- redirect.archlinux.org. ping statistics ---
383 packets transmitted, 0 received, 100% packet loss, time 391205ms

It looks to me like DNS is working because it resolves to an IP, but it can't ping it for some reason. I get the same thing if I ping the IP directly. I can, however, ping local IPs, including my gateway.

Last edited by nexus (Yesterday 18:47:26)

nexus

Member

Registered: 2022-04-26

Posts: 9

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

Apparently the ethernet connection is working, though, because pacman works.

cryptearth

Member

Registered: 2024-02-03

Posts: 1,995

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

wild guess in the blue: this is a wifi connection with a captive portal
iirc the install environment has lynx - see what comes with

lynx http://_gateway

nexus

Member

Registered: 2022-04-26

Posts: 9

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

I get a blank document

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 73,587

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

Could be JS powered missing <noscript> - but not getting an error means sth. is listening on _gateway:80

curl -L _gateway

Captive portals would hijack DNS so that's unlikely.

I can ping 8.8.8.8, but not other external IPs. For example … pacman works

Can you

ping -6 archlinux.org

(Though that doesn't fit your ability to reach 8.8.8.8)

tracepath archlinux.org

(this will eventually get you "no response" outputs but wait until tracepath quits on its own)

ping -c1 google.com
tracepath google.com

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-thc

Member

Registered: 2017-03-15

Posts: 1,099

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

For the record: In a dual stack environment (IPv4/IPv6) "_gateway" may be resolved to the IPv6 LLA and the router may not listen or reject queries on this address:

[thc@box ~]$ ping -c 1 _gateway
PING _gateway (fe80::2aa4:7fff:fe55:de90%eth0) 56 data bytes
64 bytes from _gateway (fe80::2aa4:7fff:fe55:de90%eth0): icmp_seq=1 ttl=64 time=1.17 ms

[thc@box ~]$ curl -L _gateway
curl: (56) Recv failure: Connection reset by peer

nexus

Member

Registered: 2022-04-26

Posts: 9

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

Because this is on a computer that's not fully setup, I have taken photos of the input/output of the commands that you all proposed.

In this first one, ignore the first two commands. I forgot to plug in my ethernet cable until after I issued those commands.

nexus

Member

Registered: 2022-04-26

Posts: 9

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

I just checked that once I

arch-chroot

into the new install that I can, in fact,

ping google.com

and

ping.archlinux.org

sucessfully.

So, maybe this is totally fine?

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 73,587

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

So, maybe this is totally fine?

Sure it's related to the chroot and not to

I forgot to plug in my ethernet cable until after I issued those commands.

timing?
The iso boot is supposed to provide a full network stack and as a matter of fact, arch-chroot would inherit it from there.

In the screenshots you were able to ping google and your _gateway is your router and its webpage is just https://en.wikipedia.org/wiki/ASP.NET (so I wasn't all that off w/ the JS assumption)
What "external IPs" did (and/or "do") you fail to ping?

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nexus

Member

Registered: 2022-04-26

Posts: 9

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

Honestly, I'm more confused now. I can ping google.com, duckduckgo.com, archlinux.com, and ping.archlinux.org successfully from the archiso. I rebooted into it and checked.

I really don't think it was the cable issue outside of those two commands that I mentioned. As I said in the original post, I could ping 8.8.8.8, but not other addresses not on the LAN, and the DNS resolved addresses. So, I was connected to something. For example, when I unplug the cable and ping, I get

root@archiso ~ # ping archlinux.org
ping: archlinux.org: Temporary failure in name resolution

not the lost packets in the original post.

I can mark this solved. Sorry I don't have a better explanation for what changed.

Last edited by nexus (2026-03-12 22:28:30)

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 73,587

Re: archiso can ping 8.8.8.8 but not other external IPs [SOLVED]

Set it solved - if there's an actual problem of sorts (might have been fluctuation in your ISPs routing?) it will show up again, then feel free to re-open the thread w/ the additional data.

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