To be honest, I don't know the effect of using two helper addresses on one interface. It may not provide any redundancy, if that's your hope, but I'm not sure. Anyone know?
However, I do have one other quick suggestion. Make sure the switches that connect the problematic PCs are using portfast. This sound like a portfast problem. You say the PCs don't renew their lease when they reboot. Unfortunately they can't if the switch is not yet forwarding their DHCP requests because it's doing its ridiculously long state-changes for spanning tree. It doesn't start forwarding for many seconds. If you set it to portfast, you avoid this problem. (Only do that if you know the switch ports just connect PCs and no other switches perhaps in a redundant fashion, resulting in spanning tree havoc.) Priscilla Firesox wrote: > > Thanks for the comments > My answers below. > > Yes both DHCP servers are on the same broadcast domain at the > hub site. > I have two helper addresses on the same interface(remote site, > thinking > redundancy, but it may not be as effective as I thought it > would from your > comment). > What's weird is that when I manually release/renew the lease > from win95/98 > machines, it works just fine. It's just not automatic. > The machines at hub site does this automatically without any > problems. > > Thanks > > ""Priscilla Oppenheimer"" wrote in > message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Firesox wrote: > > > > > > I have two ip-helper addresses configured on 2621 which > > > connects to another > > > 2621 at the HUB where DHCP servers reside. > > > > Do you have two ip helper addresses on the same interface? > Does that > really > > do any good or does the first one just get used all the time? > Or do you > mean > > two helper addresses, one on one interface and one on another. > > > > > I have 2 Novell Netware 5.1 servers as DHPC servers. > > > > Are the Novell DHCP servers on the same LAN, IP subnet, > broadcast domain? > > > > > Lease is > > > set to 3 days > > > Everthing is working as expected except windows 95 and 98 > > > clients are not > > > renewing the IP after three days. > > > If you manually release and renew the IP, it works fine, but > > > when users turn > > > on the pc after the lease has expired, it's not renewing it > > > automatically. > > > > > > DCHP clients on the hub site are working just fine using > same > > > DHCP servers. > > > > > > Rihgt now the Helper addresses are set to unicast address > > > pointing to those > > > two servers. > > > I was wondering if setting the helper address to subnet > > > broadcast address > > > makes any difference. > > > > You need to find out why this is happening. Do the clients > attempt to > renew, > > i.e. send the DHCP requests or are they just silent? > > > > If the DHCP clients attempt to renew and their server (i.e. > the one that > > their helper address points to) doesn't respond, it might > help to change > the > > helper address to broadcast to give the other server a chance > to reply, > > assuming the servers are on the same LAN. The other router > would have to > > forward directed broadcasts for the broadcast to end up on > the LAN. > > > > But it wouldn't be advisable to make this change without > knowing why the > > problem is happening and what negative side effects could > occur from the > > change. > > > > Priscilla > > > > > > > > > > Thanks in advance. > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63392&t=63297 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
