Are you seeing that the initial connection is slow, or that the general Outlook experience is slow while working via VPN?
Initial connect slowness is most often name resoulution - and it looks like you're working at fixing that. Mid session slowness is probably a few things. First, I'd suggest switching to work offline and syncronize rather than working online. That makes a huge difference in performance for remote users, espeically when they're on the wrong end of a slow link. Second - Outlook does some stupid network tricks with packets, and that can cause some issues. It sets the do not fragment bit on many data packets, which isn't usually a problem, until you pass it across a VPN tunnel. VPN's add a fixed amount of overhead to each packet - usually a handful of bytes (I can't remember the exact amount, but its like 50ish). Tack that onto a 1500+ byte packet that has the DF bit set, and guess what, you're over your maximum transmission size, and the packet bounces with an ICMP "Need to fragment but DF bit set" kinda error. The fix is to search technet for MTU and see how to set it for about 1400. That should make a big difference too. Roger ------------------------------------------------------ Roger D. Seielstad - MCSE Sr. Systems Administrator Inovis - Formerly Harbinger and Extricity Atlanta, GA > -----Original Message----- > From: David Lloyd [mailto:David.Lloyd@;which.co.uk] > Sent: Tuesday, November 12, 2002 5:59 AM > To: Exchange Discussions > Subject: Exchange, Outlook and speed > > > Hi guys, > I have a situation where Outlook is very slow over a VPN > connection. If i > give u a bit > of history, on how i set this up then perhaps you can tell me > where i went > wrong. > > Firstly, we have an office here in the UK where Exchange 5.5 > server is > running on a PDC, > they can only afford one server, so everything runs on it. > During the day, > they have around 8 - 10 > users connect locally to it for their daily work. They only > really use it > for mail and Internet access, > and a bit of file/print. Last year i upgraded their Internet > link to ADSL > and put up a proxy (winroute), > Everything was working fine. > > The director has since move to New York to set up an office > over there, and > i set up his laptop > to VPN in to the server for his mail. Now he has set up an > additional 3 > users in this office who also > use the VPN to get mail and at times things can get slow. I > told him using > the Internet for transport, > is gonna be slow at times due to the nature of the Internet. > > However, i know i can speed things up because of the way i > initially set > things up. Name resolution seems > to be my biggest headache. I have no DNS set up and use > Netbui for name > resolution, so i guess this is gonna > add to the overhead. > > Thus RAS has TCP/IP and NETBUEI enabled > Laptops in NY have TCP/IP and NETBUEI enabled > UK users are ok and have no problems. I would like to speed > things up a bit > for the NY users. > > I'm also confused with binding orders on the server and to > what interfaces i > should bind all these > protocols to. The server has 2 nics, one for the local net > and the other > goes to the router for the > ADSL, i guess i only need to bind this side right? > > > I guess DNS would be the best way forward for name > resolution, but as i say > i have no DNS server locally. > All mail arrives at a different domain (their web site host) who then > forward it to another domain, to pop 3 mail boxes > which i then get a program (igetmail) to pick up and deliver > to exchange > server. > > When i ping the routers external and internal interfaces i get the IP > address and it resolves back to > [EMAIL PROTECTED] > > The question i want to ask, is what is the best way for me > to set this up > for a quicker connection for outlook. > How do i set up the DNS on the router! > > Any advice would be appreciated. > > David > > > CONFIDENTIAL NOTICE > This communication contains information which is confidential > and may also > be privileged. It is for the exclusive use of the intended > recipient(s). If > you are not the intended recipient please note that any distribution, > copying or use of this communication or the information in it > is strictly > prohibited. If you received this communication in error, > please notify us by > e-mail or by telephone (020 7770 7000) and then delete the > e-mail and any > copies of it. > > > _________________________________________________________________ > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > Archives: http://www.swynk.com/sitesearch/search.asp > To unsubscribe: mailto:leave-exchange@;ls.swynk.com > Exchange List admin: [EMAIL PROTECTED] > _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:leave-exchange@;ls.swynk.com Exchange List admin: [EMAIL PROTECTED]
