sbs 2008 networking problem
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From: AlexT. on 16 May 2010 17:07 Folks I'm having a rather weird networking problem with a newly installed SBS 2008 server. Basically it would seem that I am loosing connection to the "outside world" after a while - more specifically after a few hours (or possibly after a few reboots, haven't figured it out yet) This a a fairly typical SOHO setup - one SBS server, 6 client PC, one DSL bridge and a Zywall firewall / router. Everything worked just fine up until we decided to install said SBS 2008 server. Initially the setup was performed "by the book" and everything worked out of the box as expected: DHCP, DNS, file service et all. However after a moment I noticed that I lost internet connectivity on the server (internal networking always worked fine). Initially the symptom was that the DNS lookup were not working anymore and further analysis pinpointed the fact that I could not reach the outside world from the server. Typically pinging the gateway (192.168.100.1) works but pinging an outside address (say the google DNS at 8.8.8.8) does not (host unreachable). Surprisingly internet still works on the client stations (i.e. pinging 8.8.8.8 works just fine) and after manually forcing the use of an external resolver internet started to work again (internally the SBS DNS could not forward lookups to the external root servers. cached request worked just fine). After spending quite some time to diagnose without success I decided to reinstall everything from scratch (SBS server and firewall) using a new addressing scheme (172.16.1.0), Again everything worked fine initially until the symptoms came back - no more internet connectivity between the SBS server and the internet. Looking into the various server and gateway logs don't show any obvious errors The only odd thing I can see so far is that the network interface settings on the SBS server are set to "automatic" and I can't seem to be able to alter them (i.e. I can enter manual IP / DNS but they revert to automatic). Don't know if this a feature of server 2008... I can't exclude that the Zywall is somehow acting up but it worked just fine for the past 18 months and still works except for the SBS server. I will start to do some packet capture tomorrow but in the meantime any idea / suggestion most welcome. Regards --alexT
From: Frankster on 16 May 2010 18:42 1) These symptoms point to a classic case of a misconfigured DNS setup. 2) Please provide an IPCONFIG /ALL from your SBS server as well as one of your clients (asuming all clients are the same), to verify this is the issue. Sounds like you are mixing ISP provided DNS IPs with local DNS IPs for "redundancy". Don't do that. All DNS services on your network should be provided by your only by your SBS server (along with DHCP) and all DNS clients should be assigned ONLY the IP of your SBS DNS server itself for DNS. DNS/DHCP should be tunred off of the router. -Frank "AlexT." <google(a)atc.ch> wrote in message news:83f649d2-2784-4d3a-81bd-be96a0b9d713(a)w3g2000vbd.googlegroups.com... Folks I'm having a rather weird networking problem with a newly installed SBS 2008 server. Basically it would seem that I am loosing connection to the "outside world" after a while - more specifically after a few hours (or possibly after a few reboots, haven't figured it out yet)� This a a fairly typical SOHO setup - one SBS server, 6 client PC, one DSL bridge and a Zywall firewall / router. Everything worked just fine up until we decided to install said SBS 2008 server. Initially the setup was performed "by the book" and everything worked out of the box as expected: DHCP, DNS, file service et all. However after a moment I noticed that I lost internet connectivity on the server (internal networking always worked fine). Initially the symptom was that the DNS lookup were not working anymore and further analysis pinpointed the fact that I could not reach the outside world from the server. Typically pinging the gateway (192.168.100.1) works but pinging an outside address (say the google DNS at 8.8.8.8) does not (host unreachable). Surprisingly internet still works on the client stations (i.e. pinging 8.8.8.8 works just fine) and after manually forcing the use of an external resolver internet started to work again (internally the SBS DNS could not forward lookups to the external root servers. cached request worked just fine). After spending quite some time to diagnose without success I decided to reinstall everything from scratch (SBS server and firewall) using a new addressing scheme (172.16.1.0), Again everything worked fine initially until the symptoms came back - no more internet connectivity between the SBS server and the internet. Looking into the various server and gateway logs don't show any obvious errors The only odd thing I can see so far is that the network interface settings on the SBS server are set to "automatic" and I can't seem to be able to alter them (i.e. I can enter manual IP / DNS but they revert to automatic). Don't know if this a feature of server 2008... I can't exclude that the Zywall is somehow acting up but it worked just fine for the past 18 months and still works except for the SBS server. I will start to do some packet capture tomorrow but in the meantime any idea / suggestion most welcome. Regards --alexT
From: Frankster on 16 May 2010 18:44 Aside from all the spelling mistakes (LOL), I meant DHCP should be turned off on your router, not "DNS/DHCP". -Frank "Frankster" <frank(a)SPAM2TRASH.com> wrote in message news:rOadnagHu5og6W3WnZ2dnUVZ_vadnZ2d(a)giganews.com... > 1) These symptoms point to a classic case of a misconfigured DNS setup. > > 2) Please provide an IPCONFIG /ALL from your SBS server as well as one of > your clients (asuming all clients are the same), to verify this is the > issue. > > Sounds like you are mixing ISP provided DNS IPs with local DNS IPs for > "redundancy". Don't do that. All DNS services on your network should be > provided by your only by your SBS server (along with DHCP) and all DNS > clients should be assigned ONLY the IP of your SBS DNS server itself for > DNS. DNS/DHCP should be tunred off of the router. > > -Frank > > "AlexT." <google(a)atc.ch> wrote in message > news:83f649d2-2784-4d3a-81bd-be96a0b9d713(a)w3g2000vbd.googlegroups.com... > Folks > > I'm having a rather weird networking problem with a newly installed > SBS 2008 server. > > Basically it would seem that I am loosing connection to the "outside > world" after a while - more specifically after a few hours (or > possibly after a few reboots, haven't figured it out yet)� > > This a a fairly typical SOHO setup - one SBS server, 6 client PC, one > DSL bridge and a Zywall firewall / router. > > Everything worked just fine up until we decided to install said SBS > 2008 server. > > Initially the setup was performed "by the book" and everything worked > out of the box as expected: DHCP, DNS, file service et all. > > However after a moment I noticed that I lost internet connectivity on > the server (internal networking always worked fine). Initially the > symptom was that the DNS lookup were not working anymore and further > analysis pinpointed the fact that I could not reach the outside world > from the server. > > Typically pinging the gateway (192.168.100.1) works but pinging an > outside address (say the google DNS at 8.8.8.8) does not (host > unreachable). > > Surprisingly internet still works on the client stations (i.e. pinging > 8.8.8.8 works just fine) and after manually forcing the use of an > external resolver internet started to work again (internally the SBS > DNS could not forward lookups to the external root servers. cached > request worked just fine). > > After spending quite some time to diagnose without success I decided > to reinstall everything from scratch (SBS server and firewall) using a > new addressing scheme (172.16.1.0), > > Again everything worked fine initially until the symptoms came back - > no more internet connectivity between the SBS server and the internet. > > Looking into the various server and gateway logs don't show any > obvious errors > > The only odd thing I can see so far is that the network interface > settings on the SBS server are set to "automatic" and I can't seem to > be able to alter them (i.e. I can enter manual IP / DNS but they > revert to automatic). Don't know if this a feature of server 2008... > > I can't exclude that the Zywall is somehow acting up but it worked > just fine for the past 18 months and still works except for the SBS > server. > > I will start to do some packet capture tomorrow but in the meantime > any idea / suggestion most welcome. > > Regards > > --alexT
From: Cliff Galiher - MVP on 16 May 2010 18:57 Normally I'd agree, but if pinging an IP works (the OP used 8.8.8.8 as an example) and then stops, that is not DNS related. This is the SBS server itself failing to access or use the default gateway properly and is unrelated to DNS. My suggestion is as follows: 1) Check and download the latest NIC drivers. Don't rely on the out-of-box 2008 drivers for NICs. 2) Disable the advanced onboard NIC features such as TOE and chimney. 3) Try using another gateway device. Maybe the "firewall" component of your current gateway is not playing well with the 2008 networking stack. I've seen it before where a firewall doesn't like IPv6 or some other thing that newer OS's do and locks out the machine at the MAC address level. -Cliff "Frankster" <frank(a)SPAM2TRASH.com> wrote in message news:rOadnagHu5og6W3WnZ2dnUVZ_vadnZ2d(a)giganews.com... > 1) These symptoms point to a classic case of a misconfigured DNS setup. > > 2) Please provide an IPCONFIG /ALL from your SBS server as well as one of > your clients (asuming all clients are the same), to verify this is the > issue. > > Sounds like you are mixing ISP provided DNS IPs with local DNS IPs for > "redundancy". Don't do that. All DNS services on your network should be > provided by your only by your SBS server (along with DHCP) and all DNS > clients should be assigned ONLY the IP of your SBS DNS server itself for > DNS. DNS/DHCP should be tunred off of the router. > > -Frank > > "AlexT." <google(a)atc.ch> wrote in message > news:83f649d2-2784-4d3a-81bd-be96a0b9d713(a)w3g2000vbd.googlegroups.com... > Folks > > I'm having a rather weird networking problem with a newly installed > SBS 2008 server. > > Basically it would seem that I am loosing connection to the "outside > world" after a while - more specifically after a few hours (or > possibly after a few reboots, haven't figured it out yet)� > > This a a fairly typical SOHO setup - one SBS server, 6 client PC, one > DSL bridge and a Zywall firewall / router. > > Everything worked just fine up until we decided to install said SBS > 2008 server. > > Initially the setup was performed "by the book" and everything worked > out of the box as expected: DHCP, DNS, file service et all. > > However after a moment I noticed that I lost internet connectivity on > the server (internal networking always worked fine). Initially the > symptom was that the DNS lookup were not working anymore and further > analysis pinpointed the fact that I could not reach the outside world > from the server. > > Typically pinging the gateway (192.168.100.1) works but pinging an > outside address (say the google DNS at 8.8.8.8) does not (host > unreachable). > > Surprisingly internet still works on the client stations (i.e. pinging > 8.8.8.8 works just fine) and after manually forcing the use of an > external resolver internet started to work again (internally the SBS > DNS could not forward lookups to the external root servers. cached > request worked just fine). > > After spending quite some time to diagnose without success I decided > to reinstall everything from scratch (SBS server and firewall) using a > new addressing scheme (172.16.1.0), > > Again everything worked fine initially until the symptoms came back - > no more internet connectivity between the SBS server and the internet. > > Looking into the various server and gateway logs don't show any > obvious errors > > The only odd thing I can see so far is that the network interface > settings on the SBS server are set to "automatic" and I can't seem to > be able to alter them (i.e. I can enter manual IP / DNS but they > revert to automatic). Don't know if this a feature of server 2008... > > I can't exclude that the Zywall is somehow acting up but it worked > just fine for the past 18 months and still works except for the SBS > server. > > I will start to do some packet capture tomorrow but in the meantime > any idea / suggestion most welcome. > > Regards > > --alexT
From: Frankster on 16 May 2010 20:36 > Normally I'd agree, but if pinging an IP works (the OP used 8.8.8.8 as an > example) and then stops, that is not DNS related. This is the SBS server > itself failing to access or use the default gateway properly and is > unrelated to DNS. Could be. After re-reading his post, I find it hard to tell just when "internet connectivity" started/stopped working on the server or the client. -Frank
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