So I hope this information may be interesting and useful. Depending on your LAN topology, your best shot may be to display the MAC address table on your switches. If you hate the "arp" or "awk" command you must It is not so rich as Cisco output but it is good enough.īut if you think that the "arp" output contains a lot of extra information you may parse it with "awk" command: So you can see both ARP and MAC-address table in one output. Count of static, user-defined addresses associated with the managed device. The output includes the following parameters: Count of dynamic addresses currently associated with the managed device.
Allow list of Mac addresses from LAN NW access to Small NW. Allow only 1 Mac address aa-aa-aa-aa-aa-aa from Small NW to LAN NW. Hi all, I want to make this nw diagram: Small NW - (eth1)- Linux iptables - (eth0)-LAN NW. ? (192.168.10.2) at 00:50:56:f2:83:0a on eth0 Issue this command to display the MAC forwarding table. Configure iptables to allows list of MAC address. In this installment of WILT (What I Learnt Today) series, I will share how MAC Table can be used for troubleshooting Linux bridges.
#LINUX SHOW MAC ADDRESS TABLE HOW TO#
Recently as part of a comment on my blog, I learnt how to view and interpret the MAC table of Linux bridge. ? (192.168.10.1) at 00:50:56:c0:00:08 on eth0 In an earlier blog, I have talked about Linux bridge based virtual networking. 6fc Dynamic 1 FastEthernet3 0007.95dc.04c1 Dynamic 4 FastEthernet2. Example from 'show mac-address-table' The Mac address is matched with the port Number. Protocol Address Age (min) Hardware Addr Type Interface The mac-address-table Maps Mac Addresses to Physical Ports on a Switch. Total Mac Addresses for this criterion: 67 Cisco IOS devices, as networking equipment, show some more information and it contains VLAN id and entry type (static or dynamic). The "arp" or "arp -a" command shows you mac-address table (MAC-interface maping) and ARP table (MAC-IP mapping) all-in-one. If this command is long and you’d like to copy it from this article, then remember that you’ll need to paste from the Edit menu in your terminal window. At the prompt, type ifconfig -a grep HWaddr and then push enter. (Edit) On Linux you may use tcpdump instead of installing tshark which needs installation of the whole wireshark package. Like with almost everything on the Linux command line, there is more than one way to find MAC address data. If you're on Windows, use tshark -D to list all interfaces. obviously replace eth0 with the correct interface.
And I think it may be interesting for other users. replaceHe wo'nt use the "arp"or "arp -a" command for some hidden reasons. Few days ago I could see a user question about Linux analogue for Cisco "show mac-address-table" command.
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