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Hi gordon, what port numbers need to be forwarded for sipgate to work??? Thanks ed On 07/06/2010 19:37, "Edwin Rhodes" <edwin_rhodes@xxxxxxxxxxx> wrote: > Hi Gordon, just a quick question, I have a cisco sip phone, and would like > to connect it to a sip server for call in and out access any ideas? > Thanks ed > > > On 16/05/2010 12:13, "Gordon Henderson" <gordon+dcglug@xxxxxxxxxx> wrote: > >> On Fri, 14 May 2010, Rob Beard wrote: >> >>> Hi folks, >>> >>> I'm in the process of trying to create a network diagram for a network which >>> looks like a tin of spaghetti. Now some of the switches connected to this >>> network are managed and give me some details about the network (although not >>> much that I can decipher). I believe there are a couple of 10MBit hubs on >>> this network too which I'm guessing is causing a bit of a bottleneck. >>> >>> So I was wondering, does anyone know of any tools which might be able to >>> work >>> out what is on the network (I'm thinking maybe by device Mac address) so I >>> can try and pinpoint what is on the network? >> >> It's hard when you've come into something that's grown "organically" over >> the years and my own experiences of doing this involve getting down on >> your hands and knees with big sheets of paper to draw on, and pags of >> sticky labels to label devices and cabled, and manually mapping it out the >> hard way - for the physical side of it, anyway. >> >> And sometimes it's easier to just rip it out and start again. Especially >> when in one case I did a while back you lift a floor plate and find a mass >> of charred cables... >> >> As for identifying devices - you might want to use tools like ping, >> arping, fping and nmap - or simply even pinging the broadcast addresses >> then looking at the arp-cache (from a linux box, although no-doubt there >> are equivalent tools in the windows world!) Won't find boxes that are >> turned off though... However with a list of MAC addresses, you can then >> look them up to find the manufacturers - sometimes handy if you find an >> Acer laptop hidden away on a network when they tell you they've never >> bought any Acers... >> >> You may be able to snoop for switch spanning tree information - which >> might help, but it's not an area I've spent much time on - and if you have >> passive hubs, or cheap switches it's really not going to help. >> >> Another method is to simply unplug everything and wait to see who shouts >> ;-) Potentially career limiting though!!! >> >>> What I'd ideally like to achieve is to find out what is on the other end of >>> the network port but these switches (Linksys SRW224G4) don't seem to let me >>> do that. >> >> What you can do here is get a Linux box with 2 Ethernet ports and plumb it >> in-line with the switch port and the lead coming out of it. (watch out for >> the need for cross-over cables) You'd need to configure the Linux box as >> an Ethernet switch first (bridge-tools) then you can snoop the traffic >> going over that port and built up a list of MAC addresses of devices >> connected to that port. It's invasive though in that there will be a short >> period of down-time when you physically unplug the connections and re-wire >> then through the Linux box. >> >> However that's a nice switch and it is "managable" in that it support snmp >> monitoring and it supports port mirroring, so if there is a spare port, >> you can configure it to mirror another port, then all traffic going down >> the mirrored port will come down the spare port too (You just need to make >> sure it doesn't come back!) - so you stick a Linux box in it, run >> tcpdump/tshark, iftop, etc. and otherwise snoop the traffic and/or the arp >> cache. >> >> Good luck :) >> >> Gordon > > -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html