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How to configure linux routing/filtering to send packets out one interface, over a bridge and into another interface on the same box

I'm trying to test a ethernet bridging device. I have multiple ethernet ports on a linux box. I would like to send packets out one interface, say eth0 with IP 192.168.1.1, to another interface, say ...
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Is it safe to ublock 587, SMTP submission port?

We have had problems before with SMTP port 25 (smtp) - some PC's were sending spam mail throught that port. So we blocked that and only allowed only outgoing smtp servers we needed. Howerver, i read ...
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How to write proper XPath query for filtering certain application pool errors in Windows 2008 R2 Event log (“Applications” section)

does someone know how to write proper XPath query for filtering certain application pool errors in Windows 2008 R2 Event log ("Applications" section)? EventData in XML view from Application eventlog ...