Topic: Can VPN in and receive email, but not send or ping internet sites

[brianr]

I've a server where after a power cut, I'd lost one of the raid pair.  At that point "everything" was working after the reboot (I got the raid failure emails from admin), except the lost HD.

I re-added the drive using mdadm, but I guess the other drive has a hardware failure and seems to have failed to survive the re-sync.

So now the server  will accept email and a VPN, but is not sending emails (45 up the spout according to qmail qstats) and cannot ping anything on the internet by name or IP.  I've tried a post-upgrade and reboot, but still no luck. 

Plenty of disc space, no obvious message in the dmesg log or in /var/log/messages, /var/log/qmail shows

CNAME_lookup_failed_temporarily._(#4.4.3)/

In Gateway Server mode, I can ping the router, but no further.

Anyone any idea what might be broken (and how to mend it)?

[David Harper]

From the log piece it sounds like a DNS issue.

Can you ping beyond the router by IP, e.g. Google's main server - 66.102.11.104?

[brianr]

From the log piece it sounds like a DNS issue.

Can you ping beyond the router by IP, e.g. Google's main server - 66.102.11.104?

that's initially what i thought, but I cannot ping an IP either

[paradigm]

Sounds to me like a bad router or a bad dns server in your isp ,

please run the following tests :

1.connect a pc (maybe a laptop) directly to your router bypassing sme server
and try to ping google.

2.if you have a modem connected to the router try to connect it directly
to your laptop or pc used above and try pinging google.

both test will show if the problam is your router sme server , if you faill

both i would recommend giving your isp a call and asking why you cant ping

google

please post your results

[brianr]

Sounds to me like a bad router or a bad dns server in your isp ,

please run the following tests :

1.connect a pc (maybe a laptop) directly to your router bypassing sme server
and try to ping google.

2.if you have a modem connected to the router try to connect it directly
to your laptop or pc used above and try pinging google.

both test will show if the problam is your router sme server , if you faill

both i would recommend giving your isp a call and asking why you cant ping

google

please post your results

i am remote from the system as the moment, but I'll see if I can get to it tomorrow, at the moment the inability to ping is from putty when i am VPN'd into it.

I didn't think that the ISP DNS was used, it was the one in the SMEServer that resolves  things.

More likely the router is damaged (perhaps from the power failure), I'll investigate tomorrow, thanks for the suggestions.

[paradigm]

Dns works in your network like this :

client pc --- sme dns server -- if not inside local network then --- 

router dns server -- if not inside the router's local network --- isp dns servers

so if the client pc (or you with putty inside the network) pings google it will

go through all dns servers above , a problam with any of the above can give

the symptoms you posted about.

[CharlieBrady]

In Gateway Server mode, I can ping the router, but no further.

That's likely an incorrectly set default gateway, or something broken in the router or beyond.

[CharlieBrady]

So now the server  will accept email and a VPN...

Will accept email and VPN from where? From LAN, or from Internet? If from Internet, then you don't have a default gateway problem.

[brianr]

Will accept email and VPN from where? From LAN, or from Internet? If from Internet, then you don't have a default gateway problem.

Yes, VPN from internet works fine, also it is receiving email from outside ok. (just not sending it).