Os paso el log de cuando tenia el Comtrend conectado. Yo creo que es algún problema de la sesión PPP:
System Log
Date/Time Facility Severity Message
Sep 24 08:46:25 user debug syslog: iptables -t nat -D PREROUTING -i br0 -p udp --dport 5060 -j REDIRECT --to-ports 5060 2>/dev/null
Sep 24 08:46:25 user debug syslog: iptables -I INPUT 1 -i ppp_8_32_1 -p udp --dport 5060 -j ACCEPT 2>/dev/null
Sep 24 08:46:25 user debug syslog: iptables -I INPUT 1 -i ppp_8_32_1 -p udp --dport 7070:7079 -j ACCEPT 2>/dev/null
Sep 24 08:46:25 user debug syslog: iptables -t nat -A PREROUTING -i br0 -p udp --dport 5060 -j REDIRECT --to-ports 5060 2>/dev/null
Sep 24 08:46:25 user debug syslog: siproxd --config /var/siproxd/siproxd.conf &
Sep 24 08:46:25 user notice syslog: siproxd.c:192 INFO:siproxd-0.5.10-2876 i686-redhat-linux-gnu starting up
Sep 24 08:46:25 user notice syslog: siproxd.c:218 INFO:daemonized, pid=3719
Sep 24 08:46:25 user notice dnsprobe[838]: Switching Back To Primary DNS server
Sep 24 08:46:26 user debug syslog: tc qdisc del dev ppp_8_32_1 root 2>/dev/null^I^I^I^I^I^I^I^I^I
Sep 24 08:46:26 user notice syslog: sock.c:65 INFO:bound to port 5060
Sep 24 08:46:26 user notice syslog: register.c:65 WARNING:registration file not found, starting with empty table
Sep 24 08:46:26 user notice syslog: siproxd.c:265 INFO:siproxd-0.5.10-2876 i686-redhat-linux-gnu started
Sep 24 08:46:27 user debug syslog: tc qdisc add dev ppp_8_32_1 root handle 1: prio^I^I^I^I^I^I^I^I
Sep 24 08:46:27 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:1 handle 10: htb default 1^I^I^I^I^I
Sep 24 08:46:27 user info kernel: HTB init, kernel part version 3.17
Sep 24 08:46:27 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:2 handle 20: sfq^I^I^I^I^I^I^I
Sep 24 08:46:27 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:3 handle 30: sfq^I^I^I^I^I^I^I
Sep 24 08:46:28 user debug syslog: tc class add dev ppp_8_32_1 parent 10: classid 10:1 htb rate 58Kbps ceil 58Kbps^I
Sep 24 08:46:28 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 10:1 handle 1000: sfq^I^I^I^I^I^I
Sep 24 08:46:28 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 3 fw flowid 1:1^I^I
Sep 24 08:46:28 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 2 fw flowid 1:2^I^I
Sep 24 08:46:28 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 1 fw flowid 1:3^I^I
Sep 24 08:46:28 daemon debug user: dns_lookup(main.acs.telefonica.es) = 0.0.0.0
Sep 24 08:46:28 daemon err user: ACS Connect Failed: Could not resolve host main.acs.telefonica.es
Sep 24 09:23:42 user warn dnsprobe[838]: dns query failed
Sep 24 09:23:42 user crit kernel: ADSL link down
Sep 24 09:23:44 user warn dnsprobe[838]: dns query failed
Sep 24 09:23:45 daemon crit pppd[619]: Clear IP addresses. Connection DOWN.
Sep 24 09:23:45 daemon crit pppd[619]: Clear IP addresses. PPP connection DOWN.
Sep 24 09:23:46 user warn dnsprobe[838]: dns query failed
Sep 24 09:23:46 user notice dnsprobe[838]: Primary DNS server Is Down... Switching To Secondary DNS server
Sep 24 09:23:49 user crit kernel: xDSL G.994 training
Sep 24 09:23:59 user crit kernel: ADSL G.992 started
Sep 24 09:24:04 user crit kernel: ADSL G.992 channel analysis
Sep 24 09:24:10 user crit kernel: ADSL G.992 message exchange
Sep 24 09:24:10 user crit kernel: ADSL link up, Path 0, us=625, ds=7920
Sep 24 09:24:11 user debug syslog: iptables -t nat -A PREROUTING -i br0 -d 192.168.2.1 -p udp --dport 53 -j DNAT --to 128.9.0.107
Sep 24 09:24:12 daemon notice pppd[619]: PPP: Start to connect ...
Sep 24 09:24:18 user warn dnsprobe[838]: dns query failed
Sep 24 09:24:20 user warn dnsprobe[838]: dns query failed
Sep 24 09:24:22 user warn dnsprobe[838]: dns query failed
Sep 24 09:24:26 daemon notice pppd[619]: PPP: Start to connect ...
Sep 24 09:24:40 daemon notice pppd[619]: PPP: Start to connect ...
Sep 24 09:24:40 daemon crit pppd[619]: PPP server detected.
Sep 24 09:24:40 daemon crit pppd[619]: PPP session established.
Sep 24 09:24:42 daemon crit pppd[619]: PPP LCP UP.
Sep 24 09:24:42 daemon crit pppd[619]: Received valid IP address from server. Connection UP.
Sep 24 09:24:42 user debug syslog: iptables -I INPUT -i ppp_8_32_1 -p tcp --dport 21 -j DROP
Sep 24 09:24:42 user debug syslog: iptables -I INPUT -i ppp_8_32_1 -p tcp --dport 80 -j DROP
Sep 24 09:24:42 user debug syslog: iptables -I INPUT -i ppp_8_32_1 -p tcp --dport 22 -j DROP
Sep 24 09:24:42 user debug syslog: iptables -I INPUT -i ppp_8_32_1 -p tcp --dport 23 -j DROP
Sep 24 09:24:42 user debug syslog: route add default gw 192.168.153.1 2>/dev/null
Sep 24 09:24:42 user debug syslog: iptables -A FORWARD -o ppp_8_32_1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
Sep 24 09:24:42 user debug syslog: iptables -A FORWARD -i ppp_8_32_1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
Sep 24 09:24:42 user debug syslog: ifconfig br0 mtu 1492
Sep 24 09:24:42 user debug syslog: echo > /proc/net/ip_conntrack
Sep 24 09:24:42 user debug syslog: echo "1000" > /proc/sys/net/ipv4/ip_conntrack_max
Sep 24 09:24:42 user debug syslog: iptables -t nat -D PREROUTING -i br0 -d 192.168.2.1 -p udp --dport 53 -j DNAT --to 128.9.0.107 2>/dev/null
Sep 24 09:24:43 user debug syslog: iptables -t nat -D POSTROUTING -o ppp_8_32_1 -s 192.168.2.0/255.255.255.0 -j MASQUERADE 2>/dev/null
Sep 24 09:24:43 user debug syslog: iptables -t nat -A POSTROUTING -o ppp_8_32_1 -s 192.168.2.0/255.255.255.0 -j MASQUERADE
Sep 24 09:24:43 user debug syslog: iptables -t nat -D PREROUTING -i br0 -d 192.168.2.1 -p udp --dport 53 -j DNAT --to 8.8.8.8 2>/dev/null
Sep 24 09:24:43 user debug syslog: iptables -t nat -A PREROUTING -i br0 -d 192.168.2.1 -p udp --dport 53 -j DNAT --to 8.8.8.8
Sep 24 09:24:43 user debug syslog: kill -9 3719
Sep 24 09:24:53 user debug syslog: iptables -D INPUT -i ppp_8_32_1 -p udp --dport 5060 -j ACCEPT 2>/dev/null
Sep 24 09:24:53 user debug syslog: iptables -D INPUT -i ppp_8_32_1 -p udp --dport 7070:7079 -j ACCEPT 2>/dev/null
Sep 24 09:24:53 user debug syslog: iptables -t nat -D PREROUTING -i br0 -p udp --dport 5060 -j REDIRECT --to-ports 5060 2>/dev/null
Sep 24 09:24:53 user debug syslog: iptables -I INPUT 1 -i ppp_8_32_1 -p udp --dport 5060 -j ACCEPT 2>/dev/null
Sep 24 09:24:53 user debug syslog: iptables -I INPUT 1 -i ppp_8_32_1 -p udp --dport 7070:7079 -j ACCEPT 2>/dev/null
Sep 24 09:24:53 user debug syslog: iptables -t nat -A PREROUTING -i br0 -p udp --dport 5060 -j REDIRECT --to-ports 5060 2>/dev/null
Sep 24 09:24:53 user notice dnsprobe[838]: Switching Back To Primary DNS server
Sep 24 09:24:53 user debug syslog: siproxd --config /var/siproxd/siproxd.conf &
Sep 24 09:24:54 user notice syslog: siproxd.c:192 INFO:siproxd-0.5.10-2876 i686-redhat-linux-gnu starting up
Sep 24 09:24:54 user notice syslog: siproxd.c:218 INFO:daemonized, pid=4187
Sep 24 09:24:54 user notice syslog: sock.c:65 INFO:bound to port 5060
Sep 24 09:24:54 user notice syslog: register.c:65 WARNING:registration file not found, starting with empty table
Sep 24 09:24:54 user notice syslog: siproxd.c:265 INFO:siproxd-0.5.10-2876 i686-redhat-linux-gnu started
Sep 24 09:24:54 user debug syslog: tc qdisc del dev ppp_8_32_1 root 2>/dev/null^I^I^I^I^I^I^I^I^I
Sep 24 09:24:55 user debug syslog: tc qdisc add dev ppp_8_32_1 root handle 1: prio^I^I^I^I^I^I^I^I
Sep 24 09:24:56 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:1 handle 10: htb default 1^I^I^I^I^I
Sep 24 09:24:56 user info kernel: HTB init, kernel part version 3.17
Sep 24 09:24:56 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:2 handle 20: sfq^I^I^I^I^I^I^I
Sep 24 09:24:56 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:3 handle 30: sfq^I^I^I^I^I^I^I
Sep 24 09:24:56 user debug syslog: tc class add dev ppp_8_32_1 parent 10: classid 10:1 htb rate 57Kbps ceil 57Kbps^I
Sep 24 09:24:56 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 10:1 handle 1000: sfq^I^I^I^I^I^I
Sep 24 09:24:56 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 3 fw flowid 1:1^I^I
Sep 24 09:24:56 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 2 fw flowid 1:2^I^I
Sep 24 09:24:56 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 1 fw flowid 1:3^I^I
Sep 24 09:24:57 daemon debug user: dns_lookup(main.acs.telefonica.es) = 0.0.0.0
Sep 24 09:24:57 daemon err user: ACS Connect Failed: Could not resolve host main.acs.telefonica.es
Sep 24 09:25:03 syslog info -- MARK --
Sep 24 10:25:03 syslog info -- MARK --
Sep 24 10:28:29 user warn dnsprobe[838]: dns query failed
Sep 24 10:29:32 user crit kernel: ADSL link down
Sep 24 10:29:33 user warn dnsprobe[838]: dns query failed
Sep 24 10:29:35 daemon crit pppd[619]: Clear IP addresses. Connection DOWN.
Sep 24 10:29:35 daemon crit pppd[619]: Clear IP addresses. PPP connection DOWN.
Sep 24 10:29:35 user warn dnsprobe[838]: dns query failed
Sep 24 10:29:37 user warn dnsprobe[838]: dns query failed
Sep 24 10:29:37 user notice dnsprobe[838]: Primary DNS server Is Down... Switching To Secondary DNS server
Sep 24 10:29:39 user crit kernel: xDSL G.994 training
Sep 24 10:29:49 user crit kernel: ADSL G.992 started
Sep 24 10:29:53 user crit kernel: ADSL G.992 channel analysis
Sep 24 10:30:00 user crit kernel: ADSL link up, Path 0, us=640, ds=8080
Sep 24 10:30:01 user debug syslog: iptables -t nat -A PREROUTING -i br0 -d 192.168.2.1 -p udp --dport 53 -j DNAT --to 128.9.0.107
Sep 24 10:30:02 daemon notice pppd[619]: PPP: Start to connect ...
Sep 24 10:30:10 user warn dnsprobe[838]: dns query failed
Sep 24 10:30:12 user warn dnsprobe[838]: dns query failed
Sep 24 10:30:14 user warn dnsprobe[838]: dns query failed
Sep 24 10:30:16 daemon notice pppd[619]: PPP: Start to connect ...
Sep 24 10:30:30 daemon notice pppd[619]: PPP: Start to connect ...
Sep 24 10:30:30 daemon crit pppd[619]: PPP server detected.
Sep 24 10:30:30 daemon crit pppd[619]: PPP session established.
Sep 24 10:30:32 daemon crit pppd[619]: PPP LCP UP.
Sep 24 10:30:32 user debug syslog: iptables -I INPUT -i ppp_8_32_1 -p tcp --dport 21 -j DROP
Sep 24 10:30:32 daemon crit pppd[619]: Received valid IP address from server. Connection UP.
Sep 24 10:30:32 user debug syslog: iptables -I INPUT -i ppp_8_32_1 -p tcp --dport 80 -j DROP
Sep 24 10:30:32 user debug syslog: iptables -I INPUT -i ppp_8_32_1 -p tcp --dport 22 -j DROP
Sep 24 10:30:32 user debug syslog: iptables -I INPUT -i ppp_8_32_1 -p tcp --dport 23 -j DROP
Sep 24 10:30:32 user debug syslog: route add default gw 192.168.153.1 2>/dev/null
Sep 24 10:30:32 user debug syslog: iptables -A FORWARD -o ppp_8_32_1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
Sep 24 10:30:33 user debug syslog: iptables -A FORWARD -i ppp_8_32_1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
Sep 24 10:30:33 user debug syslog: ifconfig br0 mtu 1492
Sep 24 10:30:33 user debug syslog: echo > /proc/net/ip_conntrack
Sep 24 10:30:33 user debug syslog: echo "1000" > /proc/sys/net/ipv4/ip_conntrack_max
Sep 24 10:30:33 user debug syslog: iptables -t nat -D PREROUTING -i br0 -d 192.168.2.1 -p udp --dport 53 -j DNAT --to 128.9.0.107 2>/dev/null
Sep 24 10:30:33 user debug syslog: iptables -t nat -D POSTROUTING -o ppp_8_32_1 -s 192.168.2.0/255.255.255.0 -j MASQUERADE 2>/dev/null
Sep 24 10:30:33 user debug syslog: iptables -t nat -A POSTROUTING -o ppp_8_32_1 -s 192.168.2.0/255.255.255.0 -j MASQUERADE
Sep 24 10:30:33 user debug syslog: iptables -t nat -D PREROUTING -i br0 -d 192.168.2.1 -p udp --dport 53 -j DNAT --to 8.8.8.8 2>/dev/null
Sep 24 10:30:33 user debug syslog: iptables -t nat -A PREROUTING -i br0 -d 192.168.2.1 -p udp --dport 53 -j DNAT --to 8.8.8.8
Sep 24 10:30:33 user debug syslog: kill -9 4187
Sep 24 10:30:43 user debug syslog: iptables -D INPUT -i ppp_8_32_1 -p udp --dport 5060 -j ACCEPT 2>/dev/null
Sep 24 10:30:43 user debug syslog: iptables -D INPUT -i ppp_8_32_1 -p udp --dport 7070:7079 -j ACCEPT 2>/dev/null
Sep 24 10:30:43 user debug syslog: iptables -t nat -D PREROUTING -i br0 -p udp --dport 5060 -j REDIRECT --to-ports 5060 2>/dev/null
Sep 24 10:30:43 user debug syslog: iptables -I INPUT 1 -i ppp_8_32_1 -p udp --dport 5060 -j ACCEPT 2>/dev/null
Sep 24 10:30:43 user debug syslog: iptables -I INPUT 1 -i ppp_8_32_1 -p udp --dport 7070:7079 -j ACCEPT 2>/dev/null
Sep 24 10:30:43 user debug syslog: iptables -t nat -A PREROUTING -i br0 -p udp --dport 5060 -j REDIRECT --to-ports 5060 2>/dev/null
Sep 24 10:30:43 user debug syslog: siproxd --config /var/siproxd/siproxd.conf &
Sep 24 10:30:43 user notice syslog: siproxd.c:192 INFO:siproxd-0.5.10-2876 i686-redhat-linux-gnu starting up
Sep 24 10:30:43 user notice syslog: siproxd.c:218 INFO:daemonized, pid=4527
Sep 24 10:30:44 user notice syslog: sock.c:65 INFO:bound to port 5060
Sep 24 10:30:44 user notice syslog: register.c:65 WARNING:registration file not found, starting with empty table
Sep 24 10:30:44 user notice syslog: siproxd.c:265 INFO:siproxd-0.5.10-2876 i686-redhat-linux-gnu started
Sep 24 10:30:44 user debug syslog: tc qdisc del dev ppp_8_32_1 root 2>/dev/null^I^I^I^I^I^I^I^I^I
Sep 24 10:30:45 user notice dnsprobe[838]: Switching Back To Primary DNS server
Sep 24 10:30:45 user debug syslog: tc qdisc add dev ppp_8_32_1 root handle 1: prio^I^I^I^I^I^I^I^I
Sep 24 10:30:46 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:1 handle 10: htb default 1^I^I^I^I^I
Sep 24 10:30:46 user info kernel: HTB init, kernel part version 3.17
Sep 24 10:30:46 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:2 handle 20: sfq^I^I^I^I^I^I^I
Sep 24 10:30:46 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 1:3 handle 30: sfq^I^I^I^I^I^I^I
Sep 24 10:30:46 user debug syslog: tc class add dev ppp_8_32_1 parent 10: classid 10:1 htb rate 58Kbps ceil 58Kbps^I
Sep 24 10:30:46 user debug syslog: tc qdisc add dev ppp_8_32_1 parent 10:1 handle 1000: sfq^I^I^I^I^I^I
Sep 24 10:30:46 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 3 fw flowid 1:1^I^I
Sep 24 10:30:46 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 2 fw flowid 1:2^I^I
Sep 24 10:30:46 user debug syslog: tc filter add dev ppp_8_32_1 parent 1:0 prio 8 protocol ip handle 1 fw flowid 1:3^I^I
Sep 24 10:30:47 daemon debug user: dns_lookup(main.acs.telefonica.es) = 0.0.0.0
Sep 24 10:30:47 daemon err user: ACS Connect Failed: Could not resolve host main.acs.telefonica.es