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Top Forums UNIX for Advanced & Expert Users Changing single path NIC to a teamed connection in same subnet Post 303038879 by Neo on Monday 16th of September 2019 09:24:42 AM
Old 09-16-2019
What happens when you look at the arp tables, before and after?

On ethernet, as you know, the actual LAN routing is done by MAC address; so when we change IP address, we need to flush / rebuild the arp table (on both ends), generally speaking.

If we change an IP address and do not flush the arp table, there will often be an incorrect IP address <---> MAC address in the arp table and this can cause LAN routing snafus.

PS: I'm writing this based on knowledge from decades ago, off the top of my head, and have not done any research on arp in a long time.
 

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MAC-VENDOR(5)							File Formats Manual						     MAC-VENDOR(5)

NAME
mac-vendor - Ethernet vendor file for arp-scan SYNOPSIS
mac-vendor.txt DESCRIPTION
The mac-vendor.txt contains Ethernet MAC to vendor string mappings for arp-scan. It is used in addition to the IEEE OUI and IAB listings in ieee-oui.txt and ieee-iab.txt. It is for MAC-vendor mappings that are not covered by the IEEE manufacturer listings. Each line in the mac-vendor.txt file contains a MAC-vendor mapping in the form: <MAC-Prefix><TAB><Vendor> Where <MAC-Prefix> is the prefix of the MAC address in hex, and <Vendor> is the name of the vendor. The prefix can be of any length from two hex digits (one octet) to twelve hex digits (six octets, the entire Ethernet hardware address). The alphabetic hex characters [A-F] must be entered in upper case. For example: 012345 would match 01:23:45:xx:xx:xx, where xx represents any value; 0123456 would match 01:23:45:6x:xx:xx; and 01234567 would match 01:23:45:67:xx:xx. Blank lines and lines beginning with "#" are ignored. The order of entries in the file is not important. arp-scan will attempt to match larger prefixes before trying to match smaller ones, and will stop at the first match. FILES
/usr/local/share/arp-scan/mac-vendor.txt EXAMPLE
# From nmap Debian bug report #369681 dated 31 May 2006 525400 QEMU B0C420 Bochs # From RFC 2338: 00-00-5E-00-01-{VRID} 00005E0001 VRRP (last octet is VRID) # Microsoft WLBS (Windows NT Load Balancing Service) # http://www.microsoft.com/technet/prodtechnol/acs/reskit/acrkappb.mspx 02BF Microsoft WLBS (last four octets are IP address) AUTHOR
Roy Hills <Roy.Hills@nta-monitor.com> SEE ALSO
arp-scan(1) get-oui(1) get-iab(1) arp-fingerprint(1) http://www.nta-monitor.com/wiki/ The arp-scan wiki page. March 30, 2007 MAC-VENDOR(5)
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