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I decided to sniff traffic on a SDSL circuit I monitor at work with a Fluke II and got a nasty surprise. At least 62 stations come up. Funny thing is that only MAC addresses show up, not IPs or NetBIOS names, and no subnets are found. Brief background on the setup.
Two major servers are running: 1) XO SDSL circuit, 32 routable IPs attached to W2K server w/ 2 NICs and Tiny WinRoute Pro 4.26. I'm not doing NAT, strictly stateful packet inspection and firewall rules. 2) W2K VPN server w/ 3 NICs and Tiny WinRoute Pro 4.26, one routable IP configured from XO SDSL circuit.
I'm doing NAT and RIP on this box. Here's how I have it set up. NIC 1: DSL WAN IP - Use NAT on this interface NIC 2: Corporate network IP - Serves two purposes. Private corporate LAN IP, so I can access an IP printer in my office and the in-house Exchange server.
This NIC also allows corporate network access from incoming PPTP connections on the DSL circuit. I have several static routes so that workstations from the private LAN on the third NIC can access certain resources on the corporate LAN, and can otherwise access the net via DSL. NIC 3: Private LAN IP - This NIC connects workstations on a private LAN, which print to the IP printer via static routes set up to the corporate LAN NIC.
My question: Given this setup, why are MAC addresses showing up and from where? And how can I configure the firewall (if possible) so that this stops showing up? I haven't setup frame capturing on the firewall yet. I'll do that tomorrow.
The only printer I intended in setting up a static route for is a Lexmark Optra N. I mapped the whole subnet, as opposed to that one IP, on the likely event of more printers getting installed. The MAC addresses are all over the place, some of them don't even look real judging from having seen what MAC addresses from Intel and 3Com NICs look like (most PCs on the corporate network have either Intel or 3Com NICs). Here are the routing tables.
Anyone seeing this, please feel free to probe the sh.t out of me. I'd rather be told by someone here that I have a hole, as opposed to my manager telling me about it. Firewall PC (W2K server with two NICs) Interface List 0x1.
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MS TCP Loopback interface 0x1000003.00 01 03 1c 92 82. 3Com EtherLink PCI 0x1000004.00 60 08 0a 85 bb. Said by: try plugging your MAC addresses in here: » see what you come up with. I've sniffed the traffic again this morning.
It's not as bad, but there's still MAC addresses showing up. The ones that showed up this morning are below. The freaky thing about it is that if I make the sniffer monitor the traffic multiple times (turn off the sniffer, and turn it back on), it never returns the same MAC addresses. This is the first try: 771e106b6621 586bda58fac8 7bad4aad56a9 f5aaa2aa8c95 a5aa3c95d68a 4557f3d5ed79f8c Second try: fe888a52737f 3a55b580bd7a 4c00dd5775ff 3d00b3a706bb 8c679190ab28 b8dd287491db Should I turn off multicast/broadcast IP forwarding on the switch to see if it makes a difference? Said by: Looks like all healthy IP traffic.
Maybe you could post a network diagram, and a picture of where you are putting this sniffer. Also I'm a bit lost with what the problem was.
Could you re-state your goal with regard to the above trace? -Mao said by: I decided to sniff traffic on a SDSL circuit I monitor at work with a Fluke II and got a nasty surprise. At least 62 stations come up.
Funny thing is that only MAC addresses show up, not IPs or NetBIOS names, and no subnets are found. My question: Given this setup, why are MAC addresses showing up and from where? And how can I configure the firewall (if possible) so that this stops showing up?
I'll try to draft a diagram of it.
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AB3AP K3 EQ AB3AP K3 EQ NOTE: the program assumes your K3 baud rate is set to 38400. This program makes it easy to adjust your equalizer settings for the K3. The K3 has two equalization settings for transmit, one for SSB, the other for wideband voice modes; ESSB, AM, and FM. TX EQ is not applicable to CW or DATA. Notice that the '0 dB' label is a button that will zero all sliders. How it Works The program starts by reading and displaying your current settings.
You can manually set each band, zero all bands, or choose between presets. Current presets are those recommended by Joe W4TV (-16/-12/-6/0/0/3/5/6) and by Jim K9YC (-16/-16/-16/-6/0/3/5/6).
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Jim also suggests modifying bands 4 and 8 based on signal reports because voice and mic play a role. When you move a slider the setting is continually displayed, but the K3 is only updated when you release the mouse button. The K3 firmware has a command to directly and simultaneously set all Tx EQ values. However, it lacks similar commands to do so for RX EQ or to simultaneously read either RX or TX EQ settings.
As a result when setting TX EQ the K3 display will not change. In all other cases you will see the display changing as various commands are executed to read and adjust settings.