[SOLVED] No internet until tcpdump is running on vlan2

Post new topic   Reply to topic    DD-WRT Forum Index -> Advanced Networking
Goto page Previous  1, 2
Author Message
dale_gribble39
DD-WRT Guru


Joined: 11 Jun 2022
Posts: 1889

PostPosted: Sat Sep 10, 2022 15:28    Post subject: Reply with quote
If you disabled the tcpdump startup, then it looks as if the wan comes up:
Code:
Dec 31 17:00:40 orthanc user.info : [wan] : WAN is up. IP: 174.52.173.153


Code:
nslookup 174.52.173.153
Server: 
Address: 

Name:    c-174-52-173-153.hsd1.ut.comcast.net
Address:  174.52.173.153

So, if you don't have internet, then there is something amiss elsewhere...

_________________
"The woods are lovely, dark and deep,
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep." - Robert Frost

"I am one of the noticeable ones - notice me" - Dale Frances McKenzie Bozzio

<fact>code knows no gender</fact>

This is me, knowing I've ruffled your feathers, and not giving a ****
Some people are still hard-headed.

--------------------------------------
Mac Pro (Mid 2012) - Two 2.4GHz 6-Core Intel Xeon E5645 processors 64GB 1333MHz DDR3 ECC SDRAM OpenSUSE Leap 15.5
Sponsor
the-joker
DD-WRT Developer/Maintainer


Joined: 31 Jul 2021
Posts: 2146
Location: All over YOUR webs

PostPosted: Sat Sep 10, 2022 18:02    Post subject: Reply with quote
So after looking at your screenshot I sported a few issues.

Just for the heck of it remove the Domain name elyograg.org from optional settings. Hit save then apply, wait for a few seconds and reboot for good measure.

Gateway can also be safely set to the router IP 192.168.1.1

I have no idea what you're trying todo with setting the local DNS to 192.168.1.170 as well as the static DNS 1, unless your configuration is using pyhole or something similar this looks wrong.

If you have no extra DNS setup your Local DNS should be empty and your static DNS 1 point to 1.0.0.1 and a second fallback should be added e.g. 9.9.9.9 on static DNS 2

So it looks like user error so far, all this talk of everything is mostly default when clearly its not.

_________________
Saving your retinas from the burn!🔥
DD-WRT Inspired themes for routers
DD-WRT Inspired themes for the phpBB Forum
DD-WRT Inspired themes for the SVN Trac & FTP site
Join in for a chat @ #style_it_themes_public:matrix.org or #style_it_themes:discord

DD-WRT UI Themes Bug Reporting and Discussion thread

Router: ANus RT-AC68U E1 (recognized as C1)
elyograg
DD-WRT User


Joined: 11 Jul 2021
Posts: 56

PostPosted: Sat Sep 10, 2022 23:35    Post subject: Reply with quote
As far as I know, the Netgear CM-700 cable modem is not capable of anything other than bridging. I have never configured it at all, and in fact have reset it to factory defaults twice in the last few days.
elyograg
DD-WRT User


Joined: 11 Jul 2021
Posts: 56

PostPosted: Sat Sep 10, 2022 23:57    Post subject: Reply with quote
The "turn everything off, wait 5 minutes, power back up without mac cloning" procedure is a magic cureall. I never would have thought of that on my own, thank you.

I got back my original public IP address. Everything also works without tcpdump running.

I think Comcast has some kind of a problem in their network, but now I don't need to be concerned about it.
dale_gribble39
DD-WRT Guru


Joined: 11 Jun 2022
Posts: 1889

PostPosted: Sun Sep 11, 2022 0:45    Post subject: Reply with quote
It's not just Comcast that has this quirk with standard cable modems that are not combination wifi/ethernet routers. Glad to hear it resolved itself with the 5 minute power cycle trick <wink>
_________________
"The woods are lovely, dark and deep,
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep." - Robert Frost

"I am one of the noticeable ones - notice me" - Dale Frances McKenzie Bozzio

<fact>code knows no gender</fact>

This is me, knowing I've ruffled your feathers, and not giving a ****
Some people are still hard-headed.

--------------------------------------
Mac Pro (Mid 2012) - Two 2.4GHz 6-Core Intel Xeon E5645 processors 64GB 1333MHz DDR3 ECC SDRAM OpenSUSE Leap 15.5
Alozaros
DD-WRT Guru


Joined: 16 Nov 2015
Posts: 6388
Location: UK, London, just across the river..

PostPosted: Sun Sep 11, 2022 7:44    Post subject: Reply with quote
hmm... looking at your screenshot...

as the others noted:
-Basic Setup>Network Setup>local DNS must be left 0.0.0.0 unless you are using something special(pihole)..
as this interferes with DNSmasq
-Basic Setup>Optional Settings>Domain Name must be left clear

I would also suggest you to:
-disable Shortcut Forward Engine unless you have a gigantic WAN pipe 1 Gigbit + you don.t need this as this can interfere with few things...and can break few things too... (R9000 has lots of CPU power, so no need of SFE)
-Ignore WAN DNS - i would've click on this option(enable), as this will exclude your ISP DNS and will use only DNS that you specified on your router...
-Forced DNS redirection (enable) this will force devices connected to your router to use only the DNS you specified (optional)
-NTP>server ip / name - must be left blank or if you use it use IP instead of name...like 162.159.200.123 (cloudflare NTP time)

_________________
Atheros
TP-Link WR740Nv1 ---DD-WRT 55179 WAP
TP-Link WR1043NDv2 -DD-WRT 55303 Gateway/DoT,Forced DNS,AP Isolation,Ad-Block,Firewall
TP-Link WR1043NDv2 -DD-WRT 55303 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
Qualcomm-Atheros
Netgear R7800 --DD-WRT 55363 Gateway/DoT,AD-Block,Forced DNS,AP&Net Isolation,x3VLAN,Firewall,Vanilla
Netgear R9000 --DD-WRT 55363 Gateway/DoT,AD-Block,AP Isolation,Firewall,Forced DNS,x2VLAN,Vanilla
Broadcom
Netgear R7000 --DD-WRT 55363 Gateway/SmartDNS/DoH,AD-Block,Firewall,Forced DNS,x3VLAN,VPN
NOT USING 5Ghz ANYWHERE
------------------------------------------------------
Stubby DNS over TLS I DNSCrypt v2 by mac913
elyograg
DD-WRT User


Joined: 11 Jul 2021
Posts: 56

PostPosted: Sun Sep 11, 2022 18:41    Post subject: Reply with quote
I have my own internal DNS servers. They share a VIP using ucarp at the .170 internal IP address. These DNS servers are recursive internet resolvers as well as handling inside addresses for several of my own domains. I want all DNS requests to ultimately hit one of those servers.

After I solved the tcpdump problem with advice gotten here, I got DNS working exactly the way I want it by checking "Ignore WAN DNS" and disabling "No DNS Rebind". Clients are sent the router's IP address for DNS, and the router correctly queries the internal DNS server.
Goto page Previous  1, 2 Display posts from previous:    Page 2 of 2
Post new topic   Reply to topic    DD-WRT Forum Index -> Advanced Networking All times are GMT

Navigation

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum