Search found 5 matches

by niente0
2018/05/10 09:33:43
Forum: CentOS 6 - Networking Support
Topic: Strange slowness problem with iptables
Replies: 10
Views: 4099

Re: Strange slowness problem with iptables

Hello, I use the following nameservers: 1.1.1.1 and 1.0.0.1. Anyway, it seems that now the problem is solved!! I restarted the whole mailserver a couple of times and now it seems to work without slowing down. I'm not sure about what the problem was, anyway after modifying the firewall as suggested a...
by niente0
2018/05/09 09:50:44
Forum: CentOS 6 - Networking Support
Topic: Strange slowness problem with iptables
Replies: 10
Views: 4099

Re: Strange slowness problem with iptables

Hello and thanks for support.
I added the missing loopback rule to my firewall. The slowness problem still persists, so the firewall is currently disabled :? .
Do you have any other advice for finding the source of this problem? What else could I try to diagnose my mailserver?
Thanks
by niente0
2018/05/07 13:35:45
Forum: CentOS 6 - Networking Support
Topic: Strange slowness problem with iptables
Replies: 10
Views: 4099

Re: Strange slowness problem with iptables

Thank you for your analysis of rules!! I commented all the unnecessary ones. I kept 80 and 443 rules because I have webmail on my server. I also have a local DNS on it. Sadly, the problem of slowness still persists if I remove the "accept all" rule. I'm currently allowing all connections to server t...
by niente0
2018/05/07 11:12:35
Forum: CentOS 6 - Networking Support
Topic: Strange slowness problem with iptables
Replies: 10
Views: 4099

Re: Strange slowness problem with iptables

Yes sure, here it is: # Generated by iptables-save v1.4.7 on Mon May 7 12:24:47 2018 *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [3754:7940828] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -s [mailserverip]/32 -d 151.99.125.2/32 -p udp -m udp --dport 53 -j ACCEPT...
by niente0
2018/05/07 11:00:20
Forum: CentOS 6 - Networking Support
Topic: Strange slowness problem with iptables
Replies: 10
Views: 4099

Strange slowness problem with iptables

Hello, on my mailserver I have a strange behavior with iptables rules. When I try to send an email message through this server, it takes many seconds and then the message is sent (so it works but it is very slow). If at the end of all rules I add " ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 " (so disabling t...

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