I've recently upgraded our Snapgear version to 3.4.0 (linux 2.6.19) but
now I have a problem with DHCP.
Neither dnsmasq or dhcpd (ISC) responds to incoming DHCP requests! When
I do a tcpdump I can see the incoming packets, but no responding ones.
I've checked the iptables rules, but they are identical to before the
upgrade, so I doubt that's it.
The machine works fine otherwise, I can talk in both directions on all
interfaces (http, telnet and such, haven't tried the DHCP port though).
tcpdump commands:
tcpdump -i eth0 -w /var/tcpdump -s 1000 & (to capture)
tcpdump -len port bootps or port bootpc -r tcpdump (to read)
tcpdump before upgrade:
01:00:19.421385 00:16:a6:00:0c:0e > ff:ff:ff:ff:ff:ff, ethertype IPv4
(0x0800), length 590: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
Request from 00:16:a6:00:0c:0e, length: 548
01:00:22.171409 00:02:b3:01:01:01 > ff:ff:ff:ff:ff:ff, ethertype IPv4
(0x0800), length 342: 192.168.254.1.67 > 255.255.255.255.68: BOOTP/DHCP,
Reply, length: 300
01:00:22.393456 00:16:a6:00:0c:0e > ff:ff:ff:ff:ff:ff, ethertype IPv4
(0x0800), length 590: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
Request from 00:16:a6:00:0c:0e, length: 548
01:00:22.395696 00:02:b3:01:01:01 > ff:ff:ff:ff:ff:ff, ethertype IPv4
(0x0800), length 342: 192.168.254.1.67 > 255.255.255.255.68: BOOTP/DHCP,
Reply, length: 300
tcpdump after upgrade:
01:00:24.475592 00:16:a6:00:0c:0e > ff:ff:ff:ff:ff:ff, ethertype IPv4
(0x0800), length 590: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
Request from 00:16:a6:00:0c:0e, length: 548
01:00:27.447274 00:16:a6:00:0c:0e > ff:ff:ff:ff:ff:ff, ethertype IPv4
(0x0800), length 590: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
Request from 00:16:a6:00:0c:0e, length: 548
01:00:31.409525 00:16:a6:00:0c:0e > ff:ff:ff:ff:ff:ff, ethertype IPv4
(0x0800), length 590: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
Request from 00:16:a6:00:0c:0e, length: 548
and so on forever, requests coming in, but no replies going out.
The dnsmasq/dhcpd is running, it's in the "ps" list and I can't start
another ("Address already in use")
.
Any ideas?
/Jocke
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