Date: Tue, 01 Dec 2015 17:16:59 +0200 From: wishmaster <artemrts@ukr.net> To: freebsd-net@freebsd.org Subject: Re[2]: IPFW blocked my IPv6 NTP traffic Message-ID: <1448982799.434403138.1awkb6gu@frv34.fwdcdn.com> In-Reply-To: <1448982333.1269981.454734633.11BA4DB2@webmail.messagingengine.com> References: <1448920706.962818.454005905.61CF9154@webmail.messagingengine.com> <1448956697.854911427.15is5btc@frv34.fwdcdn.com> <1448982333.1269981.454734633.11BA4DB2@webmail.messagingengine.com>
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--- Original message --- From: "Mark Felder" <feld@freebsd.org> Date: 1 December 2015, 17:05:35 > > > On Tue, Dec 1, 2015, at 02:02, wishmaster wrote: > > > > Hi, Mark. > > > > > > > I'm hoping someone can explain what happened here and this isn't a bug, > > > but if it is a bug I'll gladly open a PR. > > > > > > I noticed in my ipfw logs that I was getting a log of "DENY" entries for > > > an NTP server > > > > > > Nov 30 13:35:16 gw kernel: ipfw: 4540 Deny UDP > > > [2604:a880:800:10::bc:c004]:123 [2001:470:1f11:1e8::2]:58285 in via gif0 > > > > > > Strange... I looked at ntpq output and sure enough I was trying to > > > communicate with that server. But why was it getting blocked? I don't > > > have a rule to allow IPv4 input from source port 123. I expected IPFW to > > > handle this for me. I know UDP is stateless, but firewalls are usually > > > able to "keep state" for UDP. I looked at my v4 rules which and I have > > > keep-state on there: > > > > > > # Allow all outgoing, skip to NAT > > > ###################################### > > > $cmd 01300 skipto 5000 tcp from any to any out via $pif $ks > > > $cmd 01310 skipto 5000 udp from any to any out via $pif $ks > > > $cmd 01320 skipto 5000 icmp from any to any out via $pif > > > ###################################### > > > > > > I noticed my outbound IPv6 didn't have $ks for udp, so I added it. > > > However, that had no effect. The solution was to add an incoming rule: > > > > > > $cmd 03755 allow udp from any to any src-port 123 in via $pif6 $ks > > > > > > This seems wrong. Thoughts? > > > > > > > What is your 5000 rule? > > > > $cmd 05000 nat 1 ip4 from any to any out via $pif Hey. As I understand, there is a problem in connection clients from Inet with your NTP server. If yes, why do you use NAT rule? > > In general on public interface you should: > > $cmd 12345 allow log all from any to me 123 $ks > > > > And for outgoing traffic just: > > $cmd 1234 allow log all from me to any $ks > > > > This works for me. > > -- Vitaliy
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