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ARP cache timeout



Hej

Lidt forhistorie:

2 firewalls kører noget heartbeat, og snakker sammen. Den ene er
master og den anden er slave. De har samme firewall setup. Så længe
masteren er online har alle klienterne (De er en briget skare, nok
mest Windows) ingen problemer, og fint adgang til internet.

Klienternes default gateway er en ip alias på firewallen. Dette er af
hensyn til at firewallene skal kunne snakke sammen pga. clusteret,
selvom IP'en skifter.

Når der skal skal ske en failover, lægger masteren sit ip alias ned,
og slaven rejser et tilsvarende ip alias.

Altså, vil det for klienterne se ud som om deres default gateway har
skiftet MAC addresse.

Og nu til spørgsmålet:
Kan man lave en eller anden form for
Den-her-mac-adresse-har-IP-blabla-vær-venlig-at-ret-jeres-ARP-tabel-t
il-protokol, eller er man bare tvunget til at vente på at alle
klienternes arp tabel timer ud ? (Det varer vist default 20 minutter
på Windows).

Jeg ved godt jeg bare kan skifte MAC adresse på slavens netkort, men
jeg synes det er lidt farligt at gøre... Er jeg bare en tøsedreng ?

Mvh.
Jesper Lund


 
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