I don't think my earlier response to this has made it past moderation, but
an update:

iptables looks pretty benign to me...:

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere            state
RELATED,ESTABLISHED
ACCEPT     icmp --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp
dpt:ssh
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp
dpt:domain
ACCEPT     udp  --  anywhere             anywhere            state NEW udp
dpt:domain
(... other rules for allowed ports)
ACCEPT     ospf --  anywhere             anywhere            state NEW
REJECT     all  --  anywhere             anywhere            reject-with
icmp-host-prohibited
Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere            PHYSDEV match
--physdev-is-bridged
ACCEPT     all  --  anywhere             anywhere            state
RELATED,ESTABLISHED
ACCEPT     icmp --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
REJECT     all  --  anywhere             anywhere            reject-with
icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination




cheers and thanks,

Ian Veach, Senior Systems Analyst
System Computing Services, Nevada System of Higher Education


On Mon, Jul 18, 2016 at 1:27 PM, ian_ve...@nshe.nevada.edu <
ian_ve...@nshe.nevada.edu> wrote:

>
> I suppose, but doubt it.   I will look when I get back in office.  We do
> pretty benign ip tables though - a few firewall exceptions,  etc., and no
> Translations or any fancy stuff.  For anycast, we do use quagga and zebra
> for the ospf, but that's only for the service addresses on the loop back
> device
>
> Thanks!
>
> Sent via the Samsung Galaxy NoteĀ® 4, an AT&T 4G LTE smartphone
>
>
> -------- Original message --------
> From: Barry Margolin <bar...@alum.mit.edu>
> Date: 07/18/2016 12:12 (GMT-08:00)
> To: comp-protocols-dns-b...@isc.org
> Subject: Re: weird transfer-source problems with one DNS node
>
> In article <mailman.111.1468862922.15653.bind-us...@lists.isc.org>,
> Ian Veach <ian_ve...@nshe.nevada.edu> wrote:
>
> > So unless I'm crazy (possible, regardless)... named is reporting using
> 230,
> > but OS is showing 240 (and remote host logs confirm 240)!?
>
> Could something in iptables be transforming it at a lower level?
>
> --
> Barry Margolin
> Arlington, MA
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