On 04/09/2015 12:46 PM, Peter Ulrich Kruppa wrote:
Am 09.04.2015 um 21:30 schrieb Mike Wright:
You can try running tcpdump to watch incoming connections while you send
yourself an email from gmail/yahoo etc. That will let you know if mail
is arriving and getting through your firewall.
tcpdump -i eth0 port 25 (assuming single ethernet card).
This is, what I see, when an mail from outside arrives:
# tcpdump -i enp4s6 port 25
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp4s6, link-type EN10MB (Ethernet), capture size 262144 bytes
21:39:21.951957 IP mail-wi0-f177.google.com.35438 > pukruppa.de.smtp:
Flags [S], seq 4222003974, win 42900, options [mss 1418,sackOK,TS val
1017047302 ecr 0,nop,wscale 7], length 0
Yes. Between these two there should have been a reply from you,
pukruppa.de.smtp > mail-wi0-f177.google.com.35438.
21:39:22.951335 IP mail-wi0-f177.google.com.35438 > pukruppa.de.smtp:
Flags [S], seq 4222003974, win 42900, options [mss 1418,sackOK,TS val
1017048302 ecr 0,nop,wscale 7], length 0
Does that say anything to you?
Which side of your router are you listening on, public or private?
If it's the public side that only shows that mail and dns are working
from outside. Now you have to test from inside.
If it's the private side it says mail is making through and your mail
server is not answering.
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