my serevr blocks ping and all access from internet
hi
I have a Centos 5 server working as firewall, dns, proxy (squid) and mail server with postfix. sometimes it blocks ping from the net and when it hapen I cant browse my site not even fetch my email through webmail from outside. But inside every thing still go well even browsing the internet, but no ping to the net (e.g pop.gmail.com). when I restart it everything come up and work fine. so any body could help please? thanks |
What do you get when you type: iptables -L -n
|
How is it connected? If it's intermittent - are you on DSL or
something, or some other home-housed solution? |
my serevr blocks ping and all access from internet
Quote:
my centos is conect to a cisco router. I've got a leased line to my ISP connected trough cisco router point-to-point. and I got some routeble IP's in my network including this server which is the gateway in the internal network and in it's time the external gateway is the router connected to the ISP. with iptables -L -n command I got Chain icmp_packets (1 references) target prot opt source destination ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 8 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 11 |
That's one of the strangest iptables rule sets I've ever seen.
Only ONE chain, pertaining to icmp? Doesn't look right. But apart from that - did you have a look in the machines logs, concentrating on time-stamps that (from your knowledge) are known-bad, i.e., when it refused traffic? Another thing I'd try (since I've never dealt with a setup with a leased line) ask my ISP for support, e.g., traffic snooping or something like that. Cheers, Tink |
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